It's only 4 chambers, but all the action occurs above the floor which looks to be about 80 feet below. Tractor beams are used in all chambers, but some light bridges and lasers are included. There's also some element re-use. It's my 80th puzzle so hence the name. If you fall, don't worry, you'll be able to get back up.

Click here to download 80 Feet Below

Excellent map - definitely one of your better maps...Thanks for creating again....!