30 March 2012 Last updated at 08:05

London 2012: From secret tests to South Africa with canoeists

Britain's top sprint canoeists have been testing their speed and power inside a giant former Ministry of Defence water tank on the UK's south coast.

Liam Heath, Jon Schofield and Jessica Walker spent time at the facility in Gosport, Hampshire, which used to be top secret, using a special chamber in which scale models of submarines were formerly tested.

Heath and Schofield have been testing some technology of their own, strapping cameras to their boats while training in South Africa over the winter, and in this excerpt from the latest episode of British Olympic Dreams they share some of their best footage.