4 August 2014 Last updated at 02:36
By Victoria Gill
Science reporter, BBC News
Marine biologist Professor J Murray Roberts describes the life found on the slopes of a mountain a kilometre beneath the sea surface
Scientists have sent a remotely operated vehicle to film one of the UK's three undersea mountains, known as seamounts.
The Hebrides Terrace Seamount, off the west coast of Scotland, is higher than Ben Nevis, but its peak is 1,000m beneath the surface.
Prof J Murray Roberts, from Heriot-Watt University, and his colleagues filmed more than 100 species on its slopes.
Prof Roberts has now shared the footage from the dive exclusively with the BBC.
He and his team used a remotely operated submersible vehicle to explore and film the aquatic mountain slopes.
"These are vast structures in the ocean," Prof Roberts explained to the BBC.
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