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So far, more than 350 miles of underwater galleries in the Yucatan have been mapped.
人們迄今為止已繪制了350英里的尤卡坦半島地下水系圖
But still, nobody yet knows the true extent of this subterranean water world.
但仍舊無人知曉這個地下水世界究竟有多大
And with good reason.
以及它形成的原因
Underwater caving is notoriously dangerous.
地下水洞是出了名的危險
When the nearest exit may be hundreds of metres or more away,
最近的出口可能遠在幾百米之外或者更遠的地方
running out of air down here would be fatal.
在這里，耗盡氧氣將是致命的
To avoid getting lost, divers carry with them a spool of string.
為了避免迷路，潛水員必須隨身攜帶一捆軸線。
It becomes their lifeline, literally.
這成了它們的救生索，絕對如此。
The string also doubles as a measuring tape, a technique that has been used here in Mexico
這根線同時也是測量尺，在墨西哥的這個地方，這種科技被用來
to chart the largest underwater cave in the world, all 1 00 miles of it.
測繪世界上最大的地下水洞，全長達100多英里。
Cave exploration often requires you to push yourself through narrow gaps in the rock.
洞穴探險需要不時擠過一些狹窄的巖石縫隙。
Cavers call such places "squeezes".
洞穴專家稱之為“瓶頸”。
