Found it. It’s definitely the smallest hideout I’ve seen on Pandora, even smaller than those shipping crates with toilets in them just before Captain Flint.
Looking straight at the entrance:
The New-U to the right and the radio just above my gun’s barrel are included as points of reference. The turret room is just a few meters ahead of me, the whirlpool is behind me (i.e. I’m looking back the way you normally come from). Jump on the pipe in my crosshairs to look inside:
On another note, getting these screenshots wasn’t easy. The first attempt crashed the X server, so I had to restart. On the second attempt I started Steam and BL2 without anything else running, and my little laptop managed to run BL2 … sort of. 12-15 fps (or maybe even less, the Steam overlay’s frame counter was disabled) makes hitting bandits hard, especially when they do their dodge moves. If this wasn’t a TVHM character in Normal Mode, I would have been soo dead. Looks like BL2 is quite the torture for this device.