The Reservoir is a puzzle map where your goal is to beat each of the 12 stages, and get to the top of Reservoir 3, which has emptied due to a pressure malfunction.
Each level you complete will cause the water level to rise just high enough to allow you to get to the next level.
However, the water level will also flood the level you are in, so you must make sure you have your diving suit on at all times.
For the helmet, I re textured the pumpkin "on head" screen so it doesn't change your visibility.
The skills and insights that these levels consist of are as following:
Each of these skills is highlighted in each level, giving the map as a whole a really balanced, well rounded feel.