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					Originally Posted by Ghoulish Delight
					
				 
				I thought the new hatch IS the question mark. 
			
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 I don't think so.  On the blast door map that Locke saw, the Pearl is listed as a station on the perifery with the question mark in the middle.  They didn't find the question mark.
What Eko saw was something like a target that could be seen from the air.
Of course, the blast door map could be inaccurate.