put fish into a pan of just boiled water and it will cook quite nicely, putting fish into a pressure cooker is bit Extreme but it would certainly cook it!
often acids like Lemon or vinigars are used to cook fish too, how about Sulphuric Acid!... overkill maybe?
not so with these fellas
BBC NEWS | Science/Nature | Fish dance on sulphur cauldrons
they would still be Raw (and likely enjoying it).