a diver
it's appropriately called the dive alarm.
When a floating submarine submerges, it deliberately goes beneath the surface - which it is designed to do
It would not be tied up.
ability of an object to float or submerge depends upon the density of the object and on the density of the liquid in which it is submerged if the density of an object is greater than the density of the liquid then the object submerges in the liquid and when its density is less than the density of liquid then it floats on the liquid as in submarines when it takes water in its hollow tank its density increases and it submerges and when it pushes out water from its hollow tanks its density decreases and ot floats on water
A hydrologist is a person who studies water, including the water cycle.
An object that floats in water has a specific gravity less than 1, indicating that its density is less than that of water. An object that completely submerges in water has a specific gravity greater than 1, indicating that its density is higher than that of water.
A trench happens when one plate submerges under another.
A vortex is a circular current of air or water. It is also a first name of a person.
A submarine submerges by adjusting its ballast tanks to let in water, making it heavier than the water it displaces, causing it to sink. To resurface, the submarine pumps air into its ballast tanks, displacing the water and causing it to rise to the surface.
As a submarine submerges, it is subjected to a high volume of water pressure, which increases the further in depth the submarine goes. They have to be built to be able to withstand this pressure.
I believe the generic name is "water trampoline."
Aquaphobia is the fear of water.