The RNLI has launched its annual Float to Live campaign from a swimming pool at the top of a high rise in Battersea.
The charity was at the Embassy Gardens Skypool this morning.
The charity, which is celebrating its 200th anniversary, is reminding people what to do if they get in trouble in the water.
You should tilt your head back with ears submerged and try to relax and control your breathing and use your hands to help you stay afloat.
Tower and Chiswick Lifeboat Stations remain the busiest in the UK.