In 1973 the Canadian submarine HMCS Okanagan came within inches of catastrophe.
A British tanker ran over it, tearing into the coning tower, tossing the submarine sideways and back....while the entire crew was inside.
Forty years later, a group of of those submariners from the Okanagan got together.... to remember the past - and to talk about the future of the service they love so much.
A service that has been overshadowed by controversy in the last few years.
Stephen Puddicombe joined them, and then joined Pauline in studio.