Only a couple inches if they are face down.
34% of all statisticians drown in a pool of water with an average depth of less than 6 inches.
if they are under water about 30 seconds after their lungs run out of oxygen.
Yes, you can drown in any water.
3 Metres Deep is the minimum depth water will be perceived as Blue. Source: Science And Technology Desk Reference ISBN: 0-8103-9176-7
3X
Take a fluids class
A person can not drown in one table spoon of water.
Depth of water
30 feet
There is no specified depth of an official water polo pool. The main idea is to be sure the pool is deep enough that no player comes in contact with it (even when a player is fully submerged). They are not to gain an advantage by using the pool bottom as leverage.
When using a starting block in the Olympics swimming pools, the minimum water depth is 1.35 meters, which is 4.43 feet deep. From the end wall the depth can range between 1 meter to 6 meters, or 3.28 feet to 19.69 feet.
Yes, a tortoise can drown if the water is too deep.