I'm very fond of Scrying Eye Games for their modern tile sets, which are in short supply. They also aren't afraid to try esoteric environments like a flooded sewer or a a coolant system on a spaceship. That said, Scrying Eye Games products are specifically meant to be print products -- or in other words, you buy them on heavy card stock like I did (at Gen Con one year I bought every modern set they had).

Unfortunately, this does not translate directly over to PDf. There are a lot of dotted black and white lines, as you can see from the cover. This means that these maps cannot simply be used as is -- you need to cut them up. That's fine if your plan is to use these tiles on a physical tabletop, but not all that helpful if you plan to use it on a virtual tabletop like Roll20.

The water is suitably realistic, with interesting shadows and ripples, but the walls consist almost entirely of big Xs with yellow and black hazard markings along the corners. This almost exclusively skews the set toward a futuristic setting or a modern water treatment plant. There's also some shoreline content, which I would have preferred to see more of.

The real purpose of this set is a sci-fi water treatment plant, and if that's what you're looking for this set will be perfect. But as is, they're not suitable for sewers. The water's a little too clear, the text a little too crisp.