Well, I think it's an improvement, but I'd be inclined to make the noises less obviously indicative of what is occuring; you've pretty much kept the person dying, just taken it 'off-camera' as it were. Perhaps something like 'strange mechanical noises' are heard, then when it opens the victim is no where to be seen? It allows for the reader to draw their own conclusions (with you strongly pointing them in a direction), but leaves the reality open.. Which can work well, as the reader THINKS they know what happened.. but wonders if it's something worse.
Oh, and I'd stick "Recording devices like cameras placed inside SCP-700-1 will be destroyed as soon as the hatch closes by unknown means." into the past tense; since you are reporting observed events, it works better to place them in the past tense, rather than state what WILL happen. (Common problem on this site.. You are the author, so you KNOW what will happen. :) )