A Glasgow student who had just completed his first year at university, and his dad are among five people trapped on a submarine that went missing during a dive.
The submersible vessel used to take tourists to view the wreck of the Titanic has been missing since Sunday morning.
Suleman Dawood, 19, a business school student at the University of Strathclyde, is among those on board - including his dad Shahzada, 48.
A University of Strathclyde spokesman said they were deeply concerned about the student, his father and the others in the vessel.
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"Our thoughts are with their families and loved ones and we continue to hope for a positive outcome," he said.
A desperate international mission has been underway to try and find the Titan vessel before their four-day oxygen supply ran out.
A US coast guard spokesperson previously said it will run out at exactly 12.08pm UK time today - but no trace has been found.
The craft submerged on Sunday morning before its support vessel lost contact with it about an hour and 45 minutes later, according to the Coast Guard.
It went missing around 435 miles south of St. John’s, Newfoundland, according to Canada’s Joint Rescue Coordination Centre in Halifax, Nova Scotia.
Labour MSP Pam Duncan-Glancy said her thoughts were with the teenager and his family while speaking at First Minister's Questions in Holyrood.
She said: "The young man on the Titan submersible is a student in Glasgow. I'm sure that everyone here will join me in sharing their thoughts with him and his family at this unprecedented and difficult time."
