Key to the #21 underground. Another one... I don't think I will have any use from this.
|Old Shed - Corpse|
|Item Type||Story Item|
|Crafting||This item cannot be crafted.|
The Underground Key is a story item that has no apparent uses, as by the time the Protagonist acquires it, they will have no further use of it.
The underground key can be found on a corpse lying next to the broken air compressor in Hideout 4 after the first night(possibly the Trader, as the corpse contains a severed head with a similar/same helmet), or in a grave next to the Old Shed. The corpse is initially buried completely, but the grave can be dug open with a Shovel that has at least 50% durability remaining.