A family of four have been rescued from Les Ecrehous after a CO2 alarm sounded.
The RNLI was called to evacuate them from the reef overnight when a CO2 detector in the hut they were sleeping in alerted them to unsafe levels of the potentially fatal gas.
The St Catherine inshore lifeboat launched just after 1 am and brought them to Jersey.
The reef is seven miles northeast of the island.
The RNLI says it was not a typical rescue but serves to highlight to boatowners and homeowners the importance of smoke and gas alarms.

J999 goes under the hammer
Regent Gymnastics Club opens new home with Olympic Equipment
Survey asks where people in Jersey go sea fishing
Recent heatwave 'good and bad' for Jersey Royals
Teens test senatorial candidates
Man jailed after sexually abusing woman and child
Warmest Jersey spring on record... again
Hospice gets Gold-winning garden from Chelsea Flower Show