* "So, I thought I could build a fish tank. Turns out, I'm better at watching fish than housing them. Witness my epic fail, and learn from my mistakes (so you don't repeat them). Also, the carpet is now slightly damp. Don't ask."
3 Layers of Underground Tunnel Systems, Utilities, Sewers + Deep Underground Military Bases (DUMBs) + Submarine Lines, Aquafers, DUMBs Under the Seabed Floor