Echoes (1973)

Filmed with a camera in a waterproof housing strapped to Greenoughs back the sequence is composed entirely of slowmotion footage shot inside the curl of waves edited to the 23minute song Echoes by Pink Floyd The group reportedly allowed Elfick and Greenough to use the music in their film in exchange for the use of Greenoughs footage as a visual background when they performed Echoes in concert This short film is known to close the documentary Crystal Voyager 1973