Guardian Flight Alaska plans to use sonar equipment to locate the three people missing and presumed dead, aboard a missing medevac plane in the waters of Frederick Sound, near the Southeast community of Kake. 

In a Facebook post by Guardian Flight Alaska on Thursday, the company said it is going to equip a boat with a, "very specialized side-scan towed sonar equipment that will trace details on the ocean floor in the search sector."

Earlier this month, a search vessel commissioned by Guardian Flight was able to detect a signal from the wrecked aircraft, originating from the underwater beacon of the Cockpit Voice Recorder. That signal allowed the search crews to launch an submersible vehicle to try and visually identify the missing aircraft, but they could not locate the aircraft.

Guardian Flight Alaska Update on Facebook

The company added in its post that the, "sonar is very sensitive and is intended to detect even small objects on the ocean floor that could aid us in our efforts to return our friends to their families."

On board the Beechraft King Air 200 was a Juneau-based flight crew: pilot Patrick Coyle, 63; flight nurse Stacie Rae Morse, 30; and flight paramedic Margaret Langston Allen, 43. 

Morse was pregnant when the plane went missing; the unborn baby has been recognized as a fourth victim.

The company ended their statement by saying, "Let's continue to pray for our missing friends, their families and everyone who is affected by this tragedy." 

It could be several days until crews deploy the sonar equipment. 

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