- Underwater caving is notoriously dangerous.
地下水洞是出了名的危险 - When the nearest exit may be hundreds of metres or more away,
最近的出口可能远在 几百米之外或者更远的地方 - 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
To avoid getting lost 为了避免迷路
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