Tia - Interesting mathematics regarding the depth where water and air densities are the same. But one minor nitpick - what percentage o the Ocean is below that depth.

The original Bathesphere (I hope I've got the name and spelling correct) used Gasoline as a float/bouyancy aid.

General point as per song The Mary Ellen Carter was alledgedly raised with the aid of compressed air - This point has been made in other threads.

The problem with attempting to raise the "Andrea Dorea" on compressed air might be fun, but overlooks the extent that corrosion will have weakened the hull and superstructure over 50 years, the need to close and dog all scuttles and vents, and the dirty great big hole the "Stokholm's" Ice Class Three bows made in her.

BTW do 'Catters realise tat the "Andrea Dorea/Stokholm" collision was the first recorded incident of the Radar assisted collision.

The problem with radar is it shows you where the other ship is, where it has been, but don't tell you what its going to to next !

Gareth