You're browsing the GameFAQs Message Boards as a guest. Sign Up for free (or Log In if you already have an account) to be able to post messages, change how messages are displayed, and view media in posts.
I've scanned absolutely everything in the game except for the Phaaze scans. However, I can't find a Puffer Mine... the Logbook FAQ states that they're found in the Airshaft at Pirate Research and it doesn't say they're missable... but there's only a lone phazon-energy ball thing...
Don't tell me Puffer Mines are a one-time scan. :<
If I remember correctly, they're in a room where you shoot four yellow switches which causes a Wall Jump surface to appear. I think you have to take out four of those Crawl Tanks before the Puffer Mines appear.