Why cavitation has no single speed limit

What is the fastest a submerged object can travel without suffering cavitation?

There is no fixed speed because geometry and depth matter; roughly forty-five knots is offered only as a tentative estimate of where suppressing cavitation becomes especially difficult.

Cavitation depends on hull and propeller shape, blade angle, depth, pressure, and speed. Vapour cavities form when local pressure falls below the liquid's vapour pressure, producing noise and potentially damaging propeller blades. Careful shaping and blade angles can reduce the problem, while pump-jets offer another approach. Roughly forty-five knots is offered as a tentative estimate of where suppression becomes especially difficult. Depth changes the surrounding water pressure, so that estimate cannot serve as a universal speed limit.