This is video #82 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 82. Grabbing Items for McNamara then Exiting Vault 22
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 notice a locked staircase, and when I open it, I find a unique weapon, the AER14 Prototype Laser. It packs an awesome punch, and I'll try it out on some monsters later. I then head up one level and find a separate cave system, which spills out into the viewing laboratory, where I find the item that Elder McNamara wanted: The HEPA 20 cartridge filter. I also find a skill book (Tales of a Junktown Jerky Vendor) and absorb it. Now that I have everything I need, I escape back out through the top level's vault door...
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