Strathclyde University student Suleman Dawood, 19, is one of five people on board the vessel which disappeared during a dive to the ship wreck.
A teenager trapped on the missing Titanic submarine is a student at Strathclyde University in Glasgow.
In a statement, they said: "We are deeply concerned about Suleman, his father and the others involved in this incident. A US coast guard spokesperson previously said it will run out at exactly 12.08pm UK time today - but no trace has been found.
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