Battle of the Atlantic 70th anniversary commemorated
8 May 2013 Last updated at 23:14 BST
A service at St Paul's Cathedral has commemorated the 70th anniversary of the Battle of the Atlantic.
Three Royal Navy warships arrived in London on Wednesday before a special evensong service.
More than 60,000 sailors and airmen lost their lives in the fighting during World War II as they tried to maintain Britain's supply lines from America.
Robert Hall has been speaking to some of those who survived.