It is bitterly cold on the deck of the Allankay and the bosun, Luca Massari, is checking that none of us are wearing contact lenses before we descend into Antarctic waters. There is a risk, he warns, that lenses will freeze solid over the eyes. Massari himself is prepared for his surroundings. He is wearing thick goggles that make him look like an Olympic ski jumper. Massari is a burly, heavily tattooed veteran of the environmental organisation Sea Shepherd, which campaigns against exploitating the oceans. His deck team are preparing…