This is video #81 of my full Fallout: New Vegas walkthrough, in 1080p HD quality. For best viewing quality, click the fullscreen button in the YouTube player, then select 1080p, or "original" for even better than 1080p!
Part 81. Deeper into Vault 22
Once in the common areas, I find the overseer's office and use his terminal to unlock a bunch of doors. I encounter lots of spore carriers and giant mantises, but they don't slow me down too much. I drop to the lowest level (pest control), where I find a cave entrance into a huge cavern. We fight tons of giant mantises and spore plants (which look like polygonal Venus fly traps). I find nothing of particular interest in the large cave, so I double back. I find an impressive transformer room with sparking transformers, as well as a LOT of weapons, ammo, and other loot. I drop into the deepest level, the pest control area, and start firing away...
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