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低能见度潜水的技巧 Tips For Low-Vis Diving

无忧潜伴 2016-11-28

John与Maggie趁着难得的假期,参加了国外的潜水活动,他们原本抱着轻松愉快的心情进行潜水活动。忽然在某一次夜潜里,John紧跟着大伙往沙地游去,希望可以看到导潜之前介绍在魔鬼海胆堆里的娃娃鱼,一不小心,沙地的泥沙被潜伴搅起,一时之间分不清东南西北,伸手不见五指,从未受过低能见度潜水的John慌了,直觉想往水面冲去,可是一时之间又分不清水面的方向。以下是在低能见度潜水的六个小技巧,希望可以帮助你在低能见度潜水时应变。

一、冷静下来,保持好中性浮力

让你的眼睛适应黑暗,不要害怕,冷静下来,你一定可以看得比你预期的更清楚。微调你的BC充排气阀,让你可以保持较稳定的中性浮力,如果你太靠近水底,你很容易就会将水底的泥沙带起来。通常来说,在水下6、7米以下能见度会比较好,因为浮游生物会聚集在有光源的地方,愈靠近水面会愈密集。善用你的潜水灯,不过千万不要拿光照你潜伴的眼睛,你可以试着照别的地方,让浮游物往灯光那头聚集。

二、设定一条路线

不管你是跟着你的指北针或是跟着导潜的路径潜水,都请你依你所可以见到的最大能见度下的地形地物设定一条路线,可能是依照礁岩的左边前进之类的。因为在最差的情况下,一条最短及原路返回的路径通常是最佳的选择。

三、相信你的装备

如果你在低能见度时认为,「指北针可能出错的,我记得应该往另一个方向去。」,请你先停下来,把指北针放平再确认一次。如果你确认指北针的方向与你感觉上的方向不对,请你相信你的指北针。一样,请你常常检查你的电脑表及深度表,并且相信它们,因为在低能见度下,往往上升的速度会过快,而且在有点焦虑的心情下,用气量也会比平常更大。

四、轻轻的踢动你的脚蹼

我知道在沙地潜水中,保持不把泥沙搅起而且又同时可以很近的看到小生物是一件非常难的事,不过请你试着去练习。或者你可以改用蛙式踢动脚蹼,或者采用洞穴潜水员的姿式,头稍微朝下,而自然的把脚提高一些。

五、闭上你的眼睛

如果你确认你已经迷失方向,在那个瞬间,你可以闭上眼睛并且深呼吸一下调整一下心情和呼吸再作决定。

、控制在特定的区域活动

如果你从事一个超低能见度的潜水,请你尽量保持游动在一个区域,并且专心的观察水里细小的生物及变化,「在水里世界一个三英尺的区域里,像是一个世界,里头有暴力、贪婪、性和细微之美。」,如果你够细心,或许你会发现这个美。

翻译:Jessica Deng

来源:Scuba Diving


Near the bottom, hang on the anchor line to recheck your equipment and re-evaluate the situation. Once your eyes have adapted to the dark, you may be able to see better than you expected. And the vis is often better below 20 feet. Plankton and other biological growth is usually thickest where there's more light. Try your dive light does it help or hurt? (Don't shine it in your buddy's eyes.) Hold it to one side to reduce reflection off suspended particles.

Be neutral. Fine-tune your buoyancy before leaving the anchor line. If you have to kick to stay off the bottom, you'll stir up silt.

Set a course. Whether you follow a compass course from the anchor line or lay out a guide line or do both depends on how much you can see. So does the route you follow. In the worst conditions, a short, straight out-and-back route is probably best.

Believe your instruments. If you think, "That compass can't be right, I've been going in a straight line," ensure that the compass is level and the card is swinging freely. If it is, believe your compass, not your instincts. Likewise, check your depth gauge and pressure gauge often, and believe them. It's easy to drift upward without visual references, and you'll use air faster than normal if you feel a little anxious.

Fin gently. It can be hard to stay close enough to the bottom to see it, yet far enough not to stir up silt with your fins. But try. Use the frog kick so you don't direct jets of water at the bottom. Or use the cave diver's posture: head slightly down, feet slightly up.

Close your eyes. If you become disoriented, close your eyes and breathe easy.

Limit your movement. To make the most of a low-vis dive, settle in one spot and focus on the macro scale. There's a whole world of violence, greed, sex and beauty in a square yard of ocean.

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