Two people had an incredibly lucky escape after wandering into a railway tunnel, only to be met by an oncoming train.
A dramatic video of the incident has been released by Northern Ireland train operator Translink to raise awareness about the dangers of trespassing on train lines.
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As the oncoming train slows to try and avoid hitting the two trespassers, one of them pulls the other into a recess in the tunnel, escaping danger.
A lifeguard waving frantically at the entrance to the tunnel alerted the driver at Downhill Strand, Co Londonderry.