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This young slipper lobster may be using this jelly as a buoyancy aid.
這只幼蟬蝦也許在利用水母保持浮力
Some of these ocean vagrants may offer protection,
一些海洋流浪者會給他人提供保護
like this pyrosome is doing for the shrimp.
群火體蟲正在保護小蝦
In the world's deepest ocean, averaging over two-and-a-half miles deep,
這里是世界上最深的海洋，平均深度超過四公里
new species are constantly being discovered.
新物種不斷被發現
Like this seahorse, never filmed before.
比如這種海馬，從未出現在鏡頭前
At dawn, these little-known creatures retreat into the safety of the abyss.
黎明時分，這些鮮為人知的生物便會撤回安全的深海中
But there are some predators that can follow them down.
但有些捕食者能夠隨它們下潛
Short-finned pilot whales are accomplished deep-sea divers.
短肢領航鯨非常擅長深海潛水
Leaving the barren upper layers behind, they can swim over half a mile down
從貧瘠的上層水域出發，它們可以向深處下潛近一公里
and use their sonar to track the huge shoals of squid.
利用聲吶追蹤成群的烏賊
But they too are being tracked.
但螳螂捕蟬，黃雀在后
