Question about "naked" swimming at great depth after pressurisation In the 1989 movie The Abyss, we see Ed Harris' character briefly swim without pressure suit (couldn't fit this into the title, hence the word 'naked') from one cabin to an other, several hundreds of meters below sea level. Now, he spent days in a compression chamber, so that the air of the underwater station supposedly was at the same pressure corresponding to the depth. Exactly what does this mean anyway? We're talking about water pressure vs air pressure? I think i don't quite grasp this concept. My main question: if indeed it is possible to swim at random depth if you spend enough time in a compression chamber, where if anywhere does the body break down? Could one theoretically swim at 6 km depth if you were sufficiently pressurized? (forgetting about temperature, breathing problems, etc). Thanks in advance.