I found this mission odd in that it was very compact with little to explore in the horizontal but way more than I must have actually found in the vertical.

The objectives in themselves are fairly simple to complete (except maybe an hard to find key which I found by accident) - it's when you check your stats at the end. I found that I was 550 short of loot, despite at one point being so high up in the map that the textures went very strange and there were no sounds.

I've walked around what appears to be all the accessible points (and as mentioned, some that possibly weren't meant to be accessible) but no joy.

Another one that I would say is worth an hour or so of your time.

Atmosphere marks are for the wet bit, mainly.