Four giant squid, one of which is said to be the length of a bus – 12 metres long – have been washed up on the northern Asturias coast of Spain. Spain’s marine agency believe that naval exercises have been causing shock waves that have contributed to their deaths, although the Spanish navy deny this. Giant squid, as in the monster that attacked Captain Nemo’s Nautilus in the Jules Verne adventure 20,000 Leagues Under the Sea, is the world’s largest invertebrate and lives at depths of up to 2,000 meters (6,562 feet).