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This map is based on the original Half-Life 2 map d1_canals_07, and also reuses a drainage ditch area from d1_canals_08.
Stacking a few props makes it possible to get on top of the combine side (for Team Deathmatch) bunker entrance. This trick allows one to survive the airstrike undamaged while being outside the bunker.
Using the "noclip" cheat reveals an inaccessible sewer tunnel between the docks and the drainage ditch. It was likely supposed to connect the two areas for a better map flow, as the drainage ditch is a dead end, but was left blocked off for some reason.