FAIRFIELD — Police are continuing to investigate what sunk a 36-foot trawler the afternoon of July 23 off of Penfield Reef.

All six people aboard were safely transferred to a Bridgeport Fire Department boat, which happened to be in the area on a training drill.

The boat’s owner, Brian McDonald, of Hulls Highway, put out a mayday call on the radio. He was unable to give a latitude and longitude, but said the boat was going down quickly.

Fairfield Police Officer Keith Perham stood by as the boaters were brought onto the fire boat. The Fairfield officer secured the “Mary Kirby” with a line and a marker, and notified the Coast Guard. McDonald told Perham the boat hit something that was submerged near Sunken Island, and one of passengers said he saw a large log. Perham said they have gotten reports lately about a lot of debris in the water.

Perham said the owner’s insurance company was working with SeaTow to make salvage arrangements. The state Department of Energy and Environmental Protection is also involved and working with the Coast Guard.

Deputy Police Chief Christopher Lyddy said the Coast Guard planned to send a dive team down to anchor the boat July 27 in the hopes that a salvage company would be able to retrieve it Monday, likely around high tide.

There is about 150 gallons on diesel fuel on the boat, which had been kept in a slip at Captain’s Cove in Bridgeport.

greilly@ctpost.com; @GreillyPost