The typically serene countryside in Wimberley was once again interrupted Friday afternoon.
In addition to the Hays County Fire Marshal's office, Sheriff's Department and the APD Bomb Squad -- this time the ATF, FBI and U.S. Marshals were executing a search warrant at 303 Deer Lake Estates.
As for the man who lives next to the cave, some neighbors call him somewhat of a survivalist.
"The person they're talking about as the neighbor who owned the house next door...I know of that person, I have dealt with him a time or two in the past," said Precinct 3 Constable Darrell Ayres.
A couple of Constable Ayres' deputies are the ones that were tipped off about a possible grenade earlier this week -- information from the tipster eventually led them to the cave next door.
Deputy Ray Helm says he stayed on top of the cave while Deputy Brown made his way in -- not knowing what he'd find.
"We could hear each other and I was shining a light below where he could see his way in. He's shining a light in and our lights kind of met the can about the same time," Helm said.
Brown spent time in the Marine Corp so he knew how dangerous the military ammo can he found could really be.
"I know what C4 is. I know what you can build inside of an ammo can and what potentially...what kind of harm it could do," Brown said.
Brown says he didn't know at the time that C4 was actually inside but the sight of that can was good enough for them to get out of there -- that's when they called the fire marshal's office and the Austin P.D. bomb squad.
Wednesday night after Constable Ayres helped with some road closures, the bomb squad detonated what turned out to be four to six pounds of C4.
"We were across the highway behind a big ambulance vehicle and they told us to hunker down, get behind it, plug your ears, open your mouth...and we put our fingers in our ears and opened our mouths and it was still extremely loud! I would say that it's probably louder than any explosion I've ever heard," Ayres said.
Constable Ayres says he's glad they were able to intercept this because he says a device of that magnitude was meant for no good.
In the meantime, the Hays County Fire Marshal's office tells us evidence was recovered Friday as part of the search effort on 303 Deer Lake.
So the investigation continues.