There's much more to waves than the part you see at the beach. And it can all start hundreds, if not thousands, of kilometres from the shore.
Walter Munk's contribution to oceanography has earned him the nickname "Einstein of the ocean". Paul Spence and Shane Keating recap his achievements as he turns 100.
A global, online survey has been launched to see whether surfers are the unsung “guardians” of the beach, rescuing people who might otherwise have drowned.