Only one boat in the convoy had an engine, towing the other two smaller vessels.
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An eyewitness saw a fire engine and ambulances, one towing snowmobiles, heading towards the pass, and two search dogs in the area of the slide.
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It found that the routine the tug crew followed before towing or entering fog was "ineffective", with the watertight engine room door left open and the crew not being used in the most effective manner once in the fog.
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