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.
Watch British Olympic Dreams from 1300 BST on BBC One this Saturday, 29 March. This episode also features swimmer David Davies, cyclist Sarah Storey, hockey player Kate Walsh and rower Helen Glover.