its because he is a good swimmer
An accurate way to write it is "deep-sea diving" while best is subjective and depends on the purpose.
Pursuit diving exerts greater pressure on the seabirds while deep plunging refers to going deep in the sea in search of the seabirds.
Someone who never goes to the deep end, cannot perform any type of stroke, and someone who never goes on the diving board.
the Invicta 8928 Men's Diving Watch will provide acurate non water saturated time up to a 660 foot depth.
One may be able to learn deep sea diving via an intensive course at diving schools. Typically a deep sea diving course may take between 3 and 7 days with several hours, at least, spent in the open water.
5/6 meters
They do not dive deep enough.
There's two parts to this: 1) Only "jump in" a pool that is approved for diving, and only where it's deep enough that you won't be injured (by hitting the pool bottom or side). 2) If there's a shallow end, there no reason a non-swimmer couldn't wade into the pool under supervision (by a swimmer who can rescue them if they get into trouble). I wouldn't recommend a non-swimmer "jump in" the deep end of a pool even with supervision.
It depends how deep you are thinking, it is water resistant, however, not deep diving submersible.
Swimming in a shallow pool can be more challenging because there is less water to work with, making it easier to hit the bottom or sides. a deep pool can provide more space to swim without those obstacles.
For a while, but you'll slowly suffocate. And if you are diving in deep water, you can't swim to the surface in a hurry, so you may die either way.
They are to inform the swimmer how deep the water is. It is always good to know the depth for safety reasons. It is not a good idea to dive into a 3 foot deep pool.