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Though it's largely for morale purposes (most boats operate in depths that if they sank would crush them), the reason for exhaling when escaping from a sunken boat is so that your lungs don't explode.
Sea pressure compresses air in the lungs, and that air expands as the person moves to shallow water. If you don't exhale as you head for the surface, you risk the air expanding in your lungs as the sea pressure decreases, rupturing the lungs and killing you.
It's not just for those in a disabled boat; the technique is also taught to divers in basic Scuba classes.
It's one thing if you're on the surface and hold your breath and then dive down; in that case, air at sea level is being compressed as you go deeper, and the volume will be the same once you return to the surface. For divers and those in submarines, the air is equalized to the ambient sea pressure at the depth in question, so the air expands as you go shallower.
Submariners are taught how to do this in Submarine School. Though I don't believe they use them anymore, we used to train in the old 100' water towers, where you entered at 100' and then rose to the surface, exhaling all the way.
What else can I help you with?
Where is Sunken ship in Pokemon Ruby?
depends on what your talking about abandoned ship:between dewford and slateport sunken submarine stolen by team aqua/magma just at the front of the entrance to evergrande city
Are there submarines on the Great Lakes?
naval submarines do not have a thing to do in those lakes but the recovery submarine type robot that searches ocacionally is brought to seek for sunken vessels in the past.
Sunken of present and past?
Sunken is not a verb so it doesn't have present or past tense. Sunken is an adjective
Which plants have sunken stomata?
generally xerophytic plants have sunken stomata
When was The Sunken World created?
The Sunken World was created in 1948.
When was The Sunken Billions created?
The Sunken Billions was created in 2008.
When was Sunken Treasures created?
Sunken Treasures was created in 1993.
When was The Sunken Cemetery created?
The Sunken Cemetery was created in 2002.
What is the opposite of a sunken area?
The opposite of a sunken area would be a raised area or an elevated area.
What causes sunken veins?
Dehidration is a major cause in sunken veins.
When was The Sunken Threshold created?
The Sunken Threshold was created in 2006-02.
Why is macavity eyes sunken in?
his eyes are sunken in because he is a cat simple.......
