You raised my curiosity, about the vehicle in HL2, so I did some surfing. I found a screenshot of the airboat, which is a more realistic look. Mine however... I took a little more unique creativity and chose to create my own. My "sewerbuggy" (what I like to call it) frame is made of pipe. The seat is actually a toilet and it runs off of CH4 (methane). There are 4 tanks under the toilet that hold the compressed gas, which is runs to the high tech engine in the toilet tank. I figured being a vehicle in the sewer, what better source of fuel than methane!!
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