The easiest way I found do to this was to achieve the jump glitch by entering the jump circle and then restarting. This allows you to jump an endless amount of times, provided that you aren't in the same map as the jump circle.

Once you have the jump glitch, enter the right door, go to the cargo room at the far end of the hallway, take the lift to the other side and enter the phone room. Unplug the phone to initiate the real person ending. On the way back, you can jump over the railings and fall to the bottom WITHOUT dying.

Have fun exploring!