Helldivers 2 devs "contemplated" underground maps, but they'd be hard to make with "a lot of tech and logistics based on it being a very different kind of gameplay"

Helldivers 2.

Helldivers 2's developers have considered adding underground maps, though we wouldn't hold our breath waiting for it to happen as it would require a huge commitment, and it'd likely be "friendly fire hell" anyway.

In the game's official Discord server, one Arrowhead Game Studios community manager was asked if there would be "some cave underground maps" at some point in the future of Helldivers 2. The asker wondered if there was a place for "close corridor" fighting against swarms of enemies, including Automatons, and "close quarter combat" against foes.