"Raptures of the depth" are caused by:
A diver working at the depth for prolonged periods has gases in the body getting compressed and dissolved in body fluids. Major gas being N2, its dissolution in the body fluids, and paicularly in the myelin sheaths of CNS neurons, results in the 'raptures of the depth'.
CO narcosis
CO2 narcosis
N2 narcosis
O2 toxicity
Respiratory System Pa 1