- running out of air down here would be fatal.
在这里 耗尽氧气将是致命的 - To avoid getting lost
为了避免迷路 - divers carry with them a spool of string.
潜水员必须随身携带一捆轴线 - It becomes their lifeline -
这成了它们的救生索 - literally.
绝对如此 - The string also doubles as a measuring tape -
这根线同时也是测量尺 - a technique that has been used here, in Mexico, to chart the largest underwater cave in the world -
在墨西哥的这个地方 这种科技被用来 测绘世界上最大的地下水洞
It becomes their lifeline - 这成了它们的救生索
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