It is believed that the sinkhole was formed by the collapse of a mass burial site that after many years, hollowed out from all of the corpses decaying.
The flooded sinkhole is a lake that separates the trapper's shack from the grower's shack. When swimming down to the bottom, lots of miscellaneous items float to the top. At the bottom are three safes, a first aid box and some barrels. Depending on the Lone Wanderer's Endurance, they may have trouble making it to the bottom of the sinkhole, looting and making it back up before running out of breath. On the surface above the sinkhole, a damaged garden gnome can be found floating in a wooden crate, with a teddy bear close to it hanging on to a wooden plank.
- Two Nuka-Cola Quantums floating on the surface after going down to the bottom.