Over thirty years ago a teenage boy, scuba-diving off Teignmouth beach in Devon, found a bronze cannon on the seabed. He discovered that it was part of an ancient ship that was wrecked some 400 years ago. After all that time under water is there still enough of the ship left for Time Team to identify it? And where did it originally come from - could it in fact have been part of the Spanish Armada?

Tony Robinson and the team take to the sea for the first ever Time Team underwater excavation.