The Hardest Fish To Spearfish

There’s a fine line between thrill and disaster in spearfishing. One second, you’re cruising through blue water, lining up the perfect shot, and the next, you’re in a full-blown underwater bar fight with a fish that did not get the memo that it was dinner. Some fish go quietly. Others? Not so much. And then there are the ones that are straight-up dangerous, the kind that can put a hole in your wetsuit, snap your spear, or make you rethink every life decision that led you to this exact moment. If you’ve been spearfishing long enough, you already know the usual suspects. If not, let me introduce you to some of the meanest, most problematic fish you’ll ever encounter—and, more importantly, how to handle them when things go sideways. Dogtooth Tuna – The Freight Train of the Ocean Dogtooth tuna are not fish. They are oceanic wrecking balls. You see one cruising just below the thermocline, and your first thought is, Damn, that’s a big one. Your second thought should be, Am I actually ready for this? Because if you’re not, this fish will show you exactly how unprepared you are. The moment you land a shot, all hell breaks loose. A dogtooth won’t just run; it’ll explode into a sprint so violent that your reel screams, your floatline whips, and your spear—if it’s not secured perfectly—might bend like a paperclip. And if you shot it anywhere other than a stone-cold kill zone, congratulations, you now have a giant, torpedo-shaped problem thrashing 100 feet below you. How to Handle It: Use the heaviest gear you can handle. A slip tip is non-negotiable. Always have a solid float system, because a big dogtooth can—and will—drown you if you try to muscle it up by hand. Let it run, let it tire itself out, and for the love of everything, don’t try to gaff it while it’s still green. That’s how people lose fingers. Giant Trevally – Aggressive, Arrogant, and Unapologetic If a dogtooth tuna is a wrecking ball, a giant trevally (GT) is the neighborhood bully who enjoys starting fights just for fun. GTs are hyper-aggressive, insanely powerful, and incredibly intelligent. They know exactly how to run you into structure, wrap your line around a reef, or make you regret not holding onto your gun just a little tighter. You don’t shoot a GT. You commit to war. They fight dirty. You land a shot, and before you can even celebrate, it’s already charging headfirst into the nearest cave, wreck, or hole, dragging your entire setup with it. Miss your chance to control the fight, and you’re either losing your gear or going in after it—neither of which are great options. How to Handle It: Shoot high, control the head, and do not let it turn into the reef. If it starts making a run, apply steady pressure—too much and you’ll rip the spear out, too little and you’re in for a long, frustrating battle. And if you think you’ve won, think again. GTs have a bad habit of playing dead, only to explode back to life at the worst possible moment. Wahoo – Fast, Unpredictable, and Stupidly Sharp The problem with wahoo isn’t their strength. It’s their speed. These fish don’t run—they teleport. You shoot, and for a split second, nothing happens. Then, out of nowhere, your line goes screaming off into the abyss, and your spear tip is holding on for dear life. Oh, and let’s not forget the teeth. Wahoo have some of the sharpest, nastiest dental work in the ocean. Get careless, and your float line turns into confetti. Ever try retrieving a fish that has turned into a razor-bladed torpedo? It’s not fun. How to Handle It: Go for a perfect shot. A bad shot on a wahoo is a guaranteed heartbreak. Always use a bungee float line to absorb the initial burst, and never, ever grab a wahoo by the gills unless you enjoy getting stitches. A quick brain spike and a firm grip on the tail will save you a world of pain. Barracuda – A Bad Attitude with Teeth Barracudas don’t play fair. They aren’t particularly strong, but what they lack in brute force, they make up for in sheer bad attitude. They’re fast, twitchy, and have a habit of turning back on you with a mouthful of knives. Shoot a barracuda, and before you even reach for your knife, it’s probably already trying to bite you. Worse, sharks love them. The moment you land one, you’ve got a high-speed dinner bell ringing through the water. If you don’t move fast, you’re about to have a whole new set of problems. How to Handle It: String it up immediately and keep your hands away from the mouth. A paralyzer tip is your friend here—once you brain it, get it out of the water fast. And if you see sharks moving in? Cut your losses and let it go. It’s not worth the fight. Marlin – The Spearfisher’s Ultimate Gamble Marlin are the holy grail of bluewater spearfishing. They are also, without a doubt, the most dangerous fish you could ever choose to mess with. A marlin isn’t just big. It’s a muscle-packed, high-speed battering ram with a built-in sword attached to its face. Landing a shot is only half the battle. The real nightmare starts when it realizes it’s hooked and starts swinging that bill like a sledgehammer. One wrong move, and you’re not just losing gear—you’re losing blood. How to Handle It: Only take the shot if you’re 100% prepared. That means heavy-duty gear, multiple floats, and a crew that knows what they’re doing. Once it’s on, keep your distance. A wounded marlin will charge, thrash, and turn a routine retrieval into a full-on rodeo. Stay calm, keep the pressure steady, and when it’s finally subdued, handle it with absolute caution. So? Spearfishing is already an extreme sport. These fish take it to another level. They’re unpredictable, powerful, and in some cases, downright mean. But with the right approach, the right gear, and a healthy respect for what you’re up against, you can not only land them—you can walk away with all your fingers intact. And if you don’t? Well, at least you’ll have one hell of a story. Meet Alchemy SThe World's Most Intelligent Carbon Fins  
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Do You Really Need A Freediving Computer

At some point, every freediver asks the question: Do I really need a freediving computer? Can’t I just use a regular dive watch, count my kicks, or rely on my buddy for depth and time? I get it. Freediving computers seem like a luxury—until you actually use one. Then, they become indispensable. The reality is, if you’re serious about freediving—whether you’re chasing depth, refining technique, or just diving safely—you need one. Period. The Freedom of Knowledge There’s something liberating about knowing exactly where you are in the water. The moment you start descending, your freediving computer kicks in, tracking your depth, time, and surface intervals with unwavering precision. It eliminates the guesswork. It gives you a level of awareness that fundamentally changes how you dive. Before I started using one, I’d surface and ask my buddy, How deep do you think I went? The answers were wildly inconsistent. Maybe 20 meters? Maybe 30? Turns out, I was often nowhere close to what I thought. Once I strapped on a freediving computer, I suddenly had concrete data: depth, time, dive speed, surface intervals. My training improved overnight. Training Smarter, Not Harder Progress in freediving isn’t just about going deeper. It’s about efficiency. A freediving computer helps refine everything. It shows your ascent and descent speeds, allowing you to tweak your technique. It lets you compare dive times, revealing what works and what doesn’t. Without one, you’re guessing. And in freediving, guessing is a terrible strategy. Take surface intervals. The most overlooked part of freediving. We all know we should wait at least twice the length of our last dive before going down again, but let’s be real—without a freediving computer, are you actually timing it? Or are you just waiting until you feel ready? Spoiler: you’re probably not waiting long enough. A computer keeps you honest. It forces discipline, and in a sport where hypoxia and blackouts are real dangers, that’s not just useful—it’s essential. Safety First, Always Speaking of safety, this is the number one reason a freediving computer is non-negotiable. Freediving is a sport built on self-awareness, but humans are not depth gauges. We don’t have an internal clock that accurately measures dive time. And we definitely don’t have a built-in safety alarm that reminds us we’re pushing our limits. A freediving computer does all of that. It tracks your surface intervals, so you don’t go again too soon. It warns you if your ascent speed is too fast, reducing the risk of lung barotrauma. Most even come with depth alarms, giving you a gentle vibration or beep at a set depth—perfect for training your dive response or reminding yourself when to start freefalling. And here’s the big one: freediving computers log everything. If something goes wrong, if you ever push too hard or feel off, you can look back at your dives and see exactly what happened. That’s not just about improvement—it’s about safety, and it’s invaluable. The Mental Edge Freediving is as much mental as it is physical. Having a freediving computer eliminates distractions and uncertainties. Instead of surfacing and wondering, Did I stay down too long? Did I go deep enough? Am I improving?—you have answers. I remember the first time I used one in a deep training session. I set a depth alarm at 20 meters to remind myself when to start relaxing into freefall. Instead of focusing on numbers or second-guessing, I let the computer do the work. The beep went off, I softened my kick, and I felt my body sink effortlessly deeper. It was a small change, but it transformed my dives. A freediving computer allows you to focus on the dive itself, not the logistics around it. More Than Just Depth A good freediving computer does more than just track depth. Many models include heart rate monitoring, surface recovery tracking, and even GPS. Some sync with apps, allowing you to analyze your dives in detail. If you’re training seriously, that’s gold. Even if you’re a recreational diver, seeing your improvement over time is addictive. There’s also the convenience factor. Some freediving computers double as everyday watches, meaning you don’t have to swap gear between training sessions. Plus, they look great. Let’s be honest—part of the appeal of any sport is the gear, and freediving computers are sleek, functional, and undeniably cool. The Bottom Line A freediving computer isn’t an accessory. It’s an investment in your safety, training, and progress. It makes you a smarter, safer, and more efficient diver. Can you dive without one? Sure. Can you train without one? Technically, yes. But why would you? The difference between having a freediving computer and not having one is night and day. Once you use one, you won’t go back. And honestly? You shouldn’t. Still Using A DIY Neck Weight?  
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Is The Growing Power Consumption Of AI Worth It

Artificial Intelligence (AI) is everywhere. From voice assistants to self-driving cars, AI is revolutionizing industries at an unprecedented pace. But as the technology advances, a darker reality is becoming impossible to ignore: AI’s insatiable energy appetite. Training and running AI models require vast amounts of electricity, and with AI’s expansion, concerns about its environmental footprint are mounting. So, is this technological progress worth the energy cost? Who is responsible for AI’s massive energy consumption? Do we really need models that require the computational power of a small city? And most importantly, what are corporations doing to address this growing issue? Let’s dive into the numbers and implications of AI’s energy consumption and whether it’s a price we can afford to pay. Breaking Down the Numbers: AI’s Energy Demands The training of large AI models is an energy-intensive process requiring high-performance computing infrastructure. To put things into perspective, GPT-3’s training process consumed approximately 1,287 MWh of electricity, emitting about 552 metric tons of CO₂. Google’s AI data centers consume around 15% of the company’s total energy use. Given that Google consumed 15.7 terawatt-hours (TWh) in 2021, that’s more electricity than some countries use in a year. The training of BERT, a widely used AI language model, consumed as much energy as an average U.S. household would in 50 days. The total energy consumption of global data centers, which includes AI and other computing needs, was estimated at 200 TWh in 2022, roughly 1% of global electricity demand. These numbers highlight the growing burden AI places on the planet’s energy resources. The Justification Debate: Do AI Benefits Outweigh the Costs? AI has brought about groundbreaking advancements. From improving medical diagnostics to optimizing logistics and supply chains, AI is solving problems in ways humans never could. But is it justifiable to burn through so much energy to train these models? AI-driven smart grids improve electricity distribution and reduce energy waste. AI-powered logistics help companies optimize routes, leading to less fuel consumption and lower emissions. Medical AI systems can process massive amounts of data to detect diseases earlier, potentially saving lives and reducing the need for energy-intensive treatments. However, AI is also being used for less critical purposes. AI-generated art, chatbot conversations that may never be read, and countless social media filters all contribute to the problem. How much of this energy consumption is essential, and how much of it is just excess? Big Tech’s Role in AI’s Energy Consumption The biggest players in AI are also the biggest contributors to its energy consumption. Tech giants like Google, Microsoft, OpenAI, Amazon, and Meta are at the forefront of AI development, and their operations are anything but energy-efficient. Google runs vast data centers worldwide, and machine learning accounts for a significant chunk of its total energy use. Microsoft has poured billions into AI research and development, running intensive AI training workloads across its global network of Azure data centers. Amazon powers its AI-driven recommendations, Alexa voice assistant, and cloud AI services through its energy-hungry AWS infrastructure. Meta relies heavily on AI for content moderation, feed personalization, and advertising algorithms, requiring thousands of servers working around the clock. With these companies leading AI innovation, they also bear the biggest responsibility for addressing its environmental impact. But are they doing enough? Corporate Solutions: Can AI Become More Energy-Efficient? Corporations are aware of AI’s energy problem and are implementing measures to mitigate its environmental impact. Many tech giants are investing in renewable energy to power their data centers. Google has pledged to run on carbon-free energy by 2030. Microsoft has also committed to becoming carbon-negative by the same year. Researchers are working on ways to train AI models with less energy. Techniques like model pruning, quantization, and distillation allow AI models to operate with fewer computations while maintaining performance. Companies are developing specialized chips optimized for AI workloads. Google’s Tensor Processing Units (TPUs) and Apple’s Neural Engine are designed to handle AI tasks more efficiently than general-purpose GPUs. Cooling accounts for a significant portion of a data center’s energy consumption. Innovations such as liquid cooling and underwater data centers are being explored to reduce power needs. Ironically, AI is being used to optimize AI itself. Meta and DeepMind have experimented with AI systems that automatically fine-tune other models to make them more energy-efficient. Are Companies Doing Enough, or Just Greenwashing? While these efforts are commendable, the reality is that AI’s energy consumption is still increasing. As AI models grow in complexity and demand skyrockets, efficiency improvements may not be able to offset the growing appetite for computing power. Are companies actually reducing their energy use, or are they just making it appear more sustainable? AI continues to evolve, raising the ethical question of whether it is being used for the right reasons. There is a difference between developing AI to diagnose cancer and using AI to generate funny cat pictures. Yet, both processes require massive computational resources. Do we need AI models capable of generating endless streams of synthetic content, flooding the internet with text, images, and videos? Is AI’s primary function becoming more about profit than solving real-world problems? Should there be regulations to limit energy-hungry AI applications that provide little societal value? The Future of AI: Energy Crisis or Sustainable Revolution? AI isn’t going anywhere—it will only grow in capability and influence. But how it grows is up to us. If we don’t actively work toward sustainable AI, we risk creating a system where innovation comes at the cost of environmental destruction. Governments, researchers, and corporations need to collaborate on policies that ensure AI development remains sustainable. Investments in low-power AI, alternative computing architectures, and responsible AI deployment will be critical in ensuring that AI’s benefits outweigh its costs.
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Andreas Pashiourtides
25/11/2020
CYPRUS
alchemy V3-30

Amazing product, it feels like I don't have any fins on but the propulsion of them is out of this world. Tried them with c4 300 and 400 foot pocket, in my opinion the v330 and the 300 foot pocketis the perfect pairing.

Verified Buyer
Lawrence
25/11/2020
UNITED STATES
alchemy S

Perfect for spearfishing! Lightweight and really durable!

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Momona Miyaoka
27/11/2020
JAPAN
alchemy V3-30

Light and easy to use.

Verified Buyer
Dylan. H
27/11/2020
TAIWAN
alchemy V3-30

Good product.

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Kathlyn Tan
31/03/2021
UNITED STATES
alchemy V3-30

I’ve been training in the pool with the V3-30 fins for 2 months now and have competed in them once. Love them! Not only are they featherlight and have amazing response, but they’re also excellent quality and so beautiful to look at. Transitioning from other fins might require a little shift in technique (at least it did for me) but keep experimenting and they’ll become a natural extension of you in no time. A shoutout to the Alchemy team for all their support and well done on working towards being carbon neutral!

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Lael
27/11/2020
NORWAY
alchemy V3-30 Pro

The product is very well executed. Responsive and good snap despite the soft stifness. The 30 degree angle produces powerful rear kicks, but would require slight adjust to your fronts. All in all a very versatile pair of blades, perfect for traveling and as an all-arounder. Very agile for underwater photography and suitable for off-season training and instructing.

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Lily Crespy
27/11/2020
FRANCE
alchemy V3

Best fins ever!

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Annette Shin
30/11/2020
SOUTH KOREA
alchemy V3

I sprained my ankle really bad early this year. And ever since, my recovered ankle still gives me the stiffness while finning. However with my pair of soft Alchemy fins, I can dive as much as I want. It is light, powerful yet gives the sophistication. My next choice of fin will definitely be an Alchemy fins :)

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Hee-jeong Park
27/11/2020
SOUTH KOREA
alchemy V3-30

It's nice!

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YungChiChen
27/11/2020
TAIWAN
alchemy V3

Good fins.

Verified Buyer