Depends on three things.
1. Rigidity of the WTC. How does it handle the pressure.ie is it compressed by the water pressure (very small factor)
2. How much does the temperature rise from the internal components engines, esc, etc.
3. most important factor. What is the displacement of the piston tank against the volume of the wtc.
Pressure1 x Volume1 = Pressure2 x Volume2
This means, when the volume decreases the pressure rises.
Half the volume, twice the pressure.
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