This video is called British Sea Life.
From Wildlife Extra:
Deep sea survey reveals thriving marine life off Somerset coast
The dive is part of Somerset Wildlife Trust’s Living Seas initiative to raise awareness of Somerset’s marine environment through public surveys and events.
Discoveries by the four professional divers and marine ecologists included two different and very diverse sea bed habitats; a boulder reef north of Gore Point and a sand and shell plain in the centre of Porlock Bay in the Bristol Channel.
They recorded rare stalked jellyfish, bunches of cuttlefish and squid eggs, squat lobsters hiding in crevices, many crab and fish species, brittle and sunstar starfish plus many sea hares, which are large and exotic looking marine molluscs.
The stalked jellyfish is a UKBAP Priority Species; a species of principal importance for the purpose of conservation of biodiversity under the Natural Environment and Rural Communities Act 2006.
Dominic Flint, marine scientist and leader of the dive team, said: “This survey complements the extensive intertidal, seashore, marine mammal and birdlife records collected by the Somerset Wildlife Trust members, volunteers and staff. This now provides a more complete picture of the fantastically diverse marine environment of the Somerset coast, which has been somewhat underappreciated in the past.
“The wealth of evidence provided by exploratory dive surveys like this, in areas where there is little or no habitat or seabed data, will ensure we have the evidence to secure their conservation and can be included in future discussions over marine protection and conservation measures.”
Nigel Phillips, Somerset Wildlife Trust’s marine ambassador, said: “Our beach survey work has shown that this coast is far richer in wildlife than many would expect despite murky water and fast-moving tidal currents, which made this a very frustrating place to survey.”