Guardian Flight Alaska is now chartering a boat to search for the crew and aircraft of the medevac flight that went missing near Kake almost three weeks ago.

Randy Lyman, Guardian Flight’s senior vice president of operations, shared the update on a Facebook post on Monday.

The company says they have a boat with two crews and two captains so the search can continue around the clock. They're looking over a six square mile area, where the water ranges from 300 to 1,000 feet deep.

The boat will use a ping detector in hopes of locating the cockpit voice recorder's underwater beacon. Guardian says the NTSB's lead investigator will be aboard the boat to support the search efforts.

"Hopefully we will be able return the crew to their loved ones and locate the aircraft to aid in the NTSB's investigation," Lyman said.

The plane went missing on a trip from Anchorage to Kake on the night of Jan. 29. Pilot Patrick Coyle, 63, pregnant flight nurse Stacie Rae Morse, 30, and flight paramedic Margaret Langston Allen, 43, were all aboard the flight. Debris believed to be from the plane's wing was found the next day in a USGS search.

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