They wouldn't blow up, but nitrogen dissolved in their blood and tissues would bubble like a shaken cola bottle that's opened too fast.
Instant bends, from 7 atm. definitely fatal if they've been at that pressure for long enough to equalize the gas pressure in the body with that of the pressure chamber.
On the other hand, if it's a simple fast cycle, then they should be ok.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain