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In page John Denver:

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The NTSB interviewed 20 witnesses about Denver's last flight. Six of them had seen the plane crash into the bay near Point Pinos.[1][8] Four said the aircraft was originally heading west. Five said that they saw the plane in a steep bank, with four saying that the bank was to the right (north). Twelve described seeing the aircraft in a steep nose-down descent. Witnesses estimated the plane's altitude between 350 and 500 feet (110 and 150 m) when heading toward the shoreline. Eight said they heard a "pop" or "backfire" accompanied by a reduction in the engine noise level just before the plane crashed into the sea.[citation needed]