I had a busted sprinkler so I swapped it out and ran the system briefly to aim the new one. As I'm walking around the lawn checking the coverage I feel a super squishy spot in the lawn. It even feels springy from the water pressure so I figure great, a broken line. Not a huge deal so I grab the shovel and start digging. Instead of a broken line, I find this.
An entire sprinkler buried about 2-3" below the top of the dirt. That one leaked like mad obviously so I swapped it for a spare I had, swiveled it up so it was actually above the ground, and now I've got a little better coverage in that part of the lawn. I'm pretty sure that thing was buried for at least 18 years lol.