On Earth, Steppes is a Chest, that you cant obtain. You can barely see it.
It is in the room where the 3 Hive Majors are. Not in the room where they spawn.
At the End of this room is a destroyed big pipe and behind it is a potential spawnpoint for a chest, that you cant obtain. You can only see it, if you look (from a certain point in the room) under the left side of the pipe.
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I spotted that chest as well and couldn't loot it. Somewhere I found a similar 'hidden' chest I couldn't reach. Don't know where it was though..