When ship's crew is rescued by deep diving lifeboat, the key problem is how to find the position of life-saving platform accurately in order to joint with U-boat.

深潜救生艇在营救船员时，关键是要准确地找到救生平台的位置进行对接。

youdao

Following the rules of a pool is key: no running, no horseplay, no diving into shallow water.

CNN: Water safety expert: 'Drowning doesn't just happen'

Following the rules of a pool is also key: no running, no horseplay, no diving into shallow water.

CNN: Water safety expert: 'Drowning doesn't just happen'

And that's wall diving, 200 feet off of the shore of both Grand Turk and Salt Key.

NPR: Hurricanes Wreak Havoc In Haiti And Cuba