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.

Islanders reminded to check tides after Portelet rescue
Rule change for pet travel to France
Health degrees for islanders offering guaranteed employment
Complaints about Jersey's public service more than double
Islanders asked to share experience of domestic abuse cases
Jersey woman to cut hair in memory of friend who lost fight with cancer
The two damaged DFDS boats returning for May
Nominations open for Jersey's election candidates