There are many ways of watching a B-movie, I try and enjoy the good parts of it, namely the underwater scenes.
Who cares if the scooter explodes (the NiMH batteries were overdischarged and the body was full of hydrogen...) or the HIDs last forever (the whole thing lastes two hours, most HIDs last two or three times that!) or the previous explores became white angelic cave bats...
I think Skiles did a great job with all the underwater scenes and them alone made the film worth watching.