You can experiment even without level modification, by crawling into the water from below:
You can walk at the bottom of a water pit. Probably another relic of programming with the lemming's pin in the floor.
If you gain even a single pixel of height, you'll drown.
Experiment what happens when this underwater walker has the swimmer ability. I conjecture that they warp to the top surface of the water, then swim.
How to crawl: When lemmings are trapped within a 1x1 hole (1xN also? I forgot), or trapped completely within terrain, they'll crawl. Roper and platformer are excellent to prepare 1x1 holes. Sometimes, a roper alone can do it, e.g., by a precise angled shot into a corner, or into the lovely
Outdoor tribe roots.
To make levels, e.g., to test with unsteeled water: Combine
lgl2 with geoo's L2 suite, copy the entire L2 directory and edit the levels within the copy.
L2 (the DOS program) will try to load levels from the emulated
C:\L2 if that exists, and from its current emulated directory otherwise. Thus, if you have several copies of L2, don't mount any of them as
C:\L2, to avoid this confusion.
-- Simon