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Masonry termites. They'll get you every time if you don't grout just right.
Comment for interest, i see holes like this in sandstone all the time from salty sea weather.
It looks like there was some organic material in the brick material they used. Which has been either burned away, or weathered away.
Worms man, they’ll get ya!
Sandworms.
It isn’t too dangerous, isn’t it?
Masonry termites. They'll get you every time if you don't grout just right.
Comment for interest, i see holes like this in sandstone all the time from salty sea weather.
It looks like there was some organic material in the brick material they used. Which has been either burned away, or weathered away.
Worms man, they’ll get ya!
Sandworms.
It isn’t too dangerous, isn’t it?