Listen to the warnings!
It really does suck when your under there smiling at the fruits of you labor...then you realize...crap!! It ain't goning to fit!!
Okay; first panic!
Then cover hole with finger,thumb or hand (do NOT stick you finger IN the hole...you are not tom thumb)
At this point you yelling and hitting things to get someones attention.....alas:
You are alone!
You look around and spy a vessel for the buses life blood!!
Sweet that's cool.....
I can guarantee this:
You can not roll out, retrieve said vessel....(some people call it a taco)
Roll back under and not make a mess....
Make sure you can cantain 20 qts+ of liquid....
Oh!....have fun and get someone other than you to take funny pictures!