L4D2: A Forgotten Place

I guess those 3 wasn't safe after all, all they remember of reaching into an oddly wooden Ladder that lead to the Chopper. /////////////////////////Time Stage 1 00:00 - 9:56 Stage 2 9:57 - 23:55 Stage 3 23:56 - 27:00 My Curiosity Kill UMP45 27:01 - 27:31 Stage 3 Continue 37:32 - 34:15 Stage 4 34:16 - 43:32 Taking a Break 43:33 - 43:52 Atsuko Survival again 43:53 - 51:08 Stage 5 51:09 - 58:24 Stage 6 58:25 - 1:07:55 Stage 7 1:07:56 - 1:15:01 Stage 8 1:15:02 - 1:20:21 Finale Start 1:20:22 - 1:22:13 Finale Tank 1:22:14 - 1:23:18 2 OF US LEFT 1:23:19 - 1:23:38 2nd Wave 1:23:39 - 1:24:27 2nd Wave Tank 1:24:28 - 1:27:39 End Credit 1:27:40 - 1:28:13