Fabien Cousteau is attempting to break his grandfather’s record for the longest time spent in an undersea laboratory.

Fifty years ago the famous oceanographer Jacques Cousteau stayed submerged for 30 days – Fabien is aiming for 31.

At the same time he’ll be observing fish behaviour and studying the impact of ocean pollution on coral reefs.

‘Aquarius’ is the last undersea lab still operating ( dozens of others have been decommissioned due to high costs) and will sit on a patch of sand about 14.5 km south of Key Largo, Florida.