Ships with underwater equipment have been deployed to the coastline off Massachusetts as the search continues for the wreckage of an air ambulance that went missing while travelling from Bermuda to Boston this month.

A spokesman for the Transport Safety Board of Canada said today that investigators from the agency were in Massachusetts last week as recovery efforts continued.

“The search for the main wreckage continues with the use of ships equipped with sonar and hydrophones,” the spokesman said this week.

The recovery effort is being co-ordinated with the National Transport Safety Board of the United States, state authorities, as well as the aircraft owner’s insurance company.

The spokesman said it was premature to offer a timeline for the recovery of the aircraft.

The US Coast Guard said debris from the Gulfstream G100 aircraft, bearing Canadian registration C-GRJ, was found by a civilian vessel off Nantucket on October 4, a day after the jet went missing.

Bermudians Sergio Wayne Lottimore and Marilyn Lavonne Bean were named as two of the six people on board the air ambulance.

Members the air ambulance crew were later named by the US Coast Guard as Captain Philip Gregory Childerhose, First Officer Thomas Henry Farquhar, Sarah Jane Paton, a flight nurse, and Jolene Beth Weir, a respiratory therapist.

All four were Canadian nationals.