Manxman passengers have been disembarked from the vessel as this morning's sailing has been delayed because of a technical issue.
The Steam Packet Company says engineers are assessing the issue before making repairs.
Passengers now have the option to get back on when the sailing can take place, or transfer to a later crossing.
Manxman was set to leave for Heysham at 8am.
An estimated departure time will be issued shortly.
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