What would you do?

Get sucked out and die.

Watched too much doctor who so probably jump in after contemplating the probability of dying

Be surprised by how I'm breathing and think it through.

And by doing so I would apply logic to the statement and break whatever is there and suffocate.

'Prisoner Zero has escaped'

I'd boldly go

Who remembers the space jumanji movie? With a huge robot and lizard people?

Go in like fuck it

Ask the doctor what the hell he gave me

If Doctor Who taught us anything, that crack is in time-space continuum. I'd hella jump through

Put on my space suit

calmly jump into the abyss

Call the Doctor

Jump

ZATHURA! or was it zephyr?

Fall back asleep.