Normally there is a risk of the bends (hydrogen bubbles building up in the blood stream)Correction:The above is incorrect. Decompression sickness (or the bends) is caused by gas bubbles comprised mostly of nitrogen (not hydrogen).
Surface, shallow-water, deep-water and saturation dives in SCUBA - to name a few.
If you mean "Ho deep can people DIVE", the limit for commercial divers is between 100 and 200 meters. There have been, however, experiments with people in pressure chambers, simulating VERY deep dives. They exceeded 600 meters.
1948 Auguste Piccard dives in his bathyscaph, the first untethered craft that carried people into the deep.
He dives deep underwater
1000 meters, or 3280 feet
Because they are able to store oxygen in their blood and muscles to use in the deep.
It depends on your experience. The limit for recreational diving is 130 feet. However, a novice diver should not be diving near that depth. According to PADI, dives deeper than 60 feet are considered deep dives.
Beowulf dives into the lake where Grendel's mother lives and swims down to her lair. There, he engages her in a fierce battle using a magical sword that he finds in the lair. Beowulf eventually defeats Grendel's mother by decapitating her with the sword.
The pressure gets too great and the submarine implodes. The deeper you go under water the more pressure there is.
Free divers do but scuba divers do not need to. Scuba divers take their air with them and would have no need to hyperventilate.
6m