Titanic sub: How oxygen could be conserved on board - BBC News

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As the search for the missing OceanGate Titan submarine enters a "critical" stage, what could the passengers on board be experiencing?

Dr Sarah Spelsberg, medical lead on the underwater research mission Project Neptune 100, explains how the experience of three of the five people within the vessel could be helping to conserve oxygen for longer.

Dr Spelsberg also discusses the chances of hypothermia and why decompression of the sub is unlikely, but would be "catastrophic" if experienced.