sadly it can, ships and planes have been vanishing with out trace for years. In this Hazel the plane lets say the plane was at 30,000 ft when its last known position is recorded by the time it hits the water it could be miles from that position. by the time anybody realises that the plane actually has gone down and organised a search many hours might have passed before anybody actually gets onsite (which in fact may be miles from the actual impact point) depending on how the plane hit the water and broke up there might be very little actual debris floating on the surface and this will in turn be scattered over a wide area by wind and tide.As a result, unless any of the various electronic beacons work or a ship is passing and actually sees the plane come in it's like looking for the proverbial needle in a haystack