The clarity of the images was astonishing - laying bare everything from the spindly grey-brown chimneys, rising at crooked angles, to the violent pitch-black jets of superheated water to the ghostly swarms of blind shrimp.

BBC: A deep sea mission of genuine exploration

She was last seen wearing blue jeans, a grey waist-length coat with brown buttons and black ankle boots.

BBC: Missing girl Sameen Ahmed last seen in Glasgow

She was wearing brown cord trousers, grey slip-on shoes and a green top.

BBC: Search for missing Marion Scott, 83, 'extensive'