Hacking the Casio F-91W to Handle 1000 Psi

The Casio F-91W is one of the most iconic watches of the past few decades. Theoretically, as water pressure increases around the watch, due to the fact that it’s filled with an incompressible liquid (as opposed to a compressible gas), it can successfully “push back” against the water and it will not succumb to implosion due to increasing pressures. I don’t have any way of testing, but a similar experiment (on a Casio G-Shock) allowed for pressures of up to 1200PSI, so I would expect similar numbers out of my watch.

Source: dvt.name