You walk forward, every footstep echoing around the corridor, and every heartbeat amplified to the sound of a troll's bongoes. You approach a large wooden box. You open it. It has no bottom, it just looks like a traditional bottomless pit. You jump down. You land in a pool of water. From here you can easily swim to the exit, by which you can see a shimmering gem.
Forward (No way back now!)