abientists are studying the effects of climate change. >> reporter: about five miles flf of islamorada in the florida keys, some groundbreaking climate science work is being done on the ground that lies beneath ocean. there's only one wayge the undersea lab-- straight down, about 50 feet. the aquarius reef base, run by florida international university, has only recently been brought back into service after being badly damaged by hurricane irma two years ago. entry is via the aptly named wet porch. >> welcome to aquarius. quite an office we have here. >> reporter: an office with all the comforts of home, and jammed full of electronic equipment that can distort tv picture, but which allows scientists like jim fourquerean, to work down here, >>metimes for weeks at a time. >> a lot of attention is paid to make sure that oxygen concentrations are correct, and the co2 is at the right level.