Like the map from a few weeks back (Divided Chambers of the Rift), this map is also organized around a central, axial hallway, although the two maps are not otherwise designed to be connected (though you could use ’em that way if you wanted, I suppose).
There was a general narrative of a prison break going through my mind as I was drawing this one up. The central blasted area being due to some energetic wall removal, or the like. Several of the rooms in the top area have metal bar doors (including the mangled one at the half-destroyed room, upper middle and the one ajar at the similar room to the left, as well as the two small ones to the right.
There is also the idea that, after the breakout, the facility remained in use for a time, with some repairs made to the hallway along the top (with the block hatch walls) in order to re-connect the two sections.
In addition to the left- and right-side entrance/exits, there is also the tunnel with the watercourse leading deeper into the unknown depths.
As usual, feel free to use for any non-commercial purpose, or contact me if you’d like to use this on a commercial project.