1 - 0:27 (press button to open hatch)
2 - 0:42 (activate elevator and send it down to open hatch)
3 - 1:04 (enter alcove)
4 - 1:43 (use wall decoration to open wall)
5 - 2:32 (use register to open hatch)
6 - 3:34 (hit button to open hatch)
7 - 3:48 (send elevator down, but jump in before door closes; ride elevator up to secret exit)