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This young slipper lobster may be using this jelly as a buoyancy aid.
这只幼蝉虾也许在利用水母保持浮力
Some of these ocean vagrants may offer protection,
一些海洋流浪者会给他人提供保护
like this pyrosome is doing for the shrimp.
群火体虫正在保护小虾
In the world's deepest ocean, averaging over two-and-a-half miles deep,
这里是世界上最深的海洋，平均深度超过四公里
new species are constantly being discovered.
新物种不断被发现
Like this seahorse, never filmed before.
比如这种海马，从未出现在镜头前
At dawn, these little-known creatures retreat into the safety of the abyss.
黎明时分，这些鲜为人知的生物便会撤回安全的深海中
But there are some predators that can follow them down.
但有些捕食者能够随它们下潜
Short-finned pilot whales are accomplished deep-sea divers.
短肢领航鲸非常擅长深海潜水
Leaving the barren upper layers behind, they can swim over half a mile down
从贫瘠的上层水域出发，它们可以向深处下潜近一公里
and use their sonar to track the huge shoals of squid.
利用声呐追踪成群的乌贼
But they too are being tracked.
但螳螂捕蝉，黄雀在后
