NB! It's recommended to go to the area of Aruküla cave on daytime, with great caution, not alone for more security and not with children! Do not enter the caves!
Recommended to approach the cache from the house side (picture attached). Approaching from the road there are two holes bounded by construction fences: one of them was once a "hatch entrance" (pictures attached). By going from the wrong side it can be more dangerous, if you can't spot the (new) holes (Terrain: 3), else Terrain: 2.
Aruküla Cave, the largest in Estonia (10 ha) - "Estonian Soviet Encyclopedia", 1985
The Aruküla caves (environmental register code KLO1000311) were taken under nature protection in 1958 and the cave has value as an object of scientific historical Devonian fish research and as a wintering area for bats.
The Environmental Board has recently (April 2020) consulted with the geologists of the Department of Geology of the University of Tartu on the subject of Aruküla caves, and according to specialists, the entire area of the cave should be fenced and warning signs should be put so that people do not accidentally go there. According to geologists, the cave is extremely dangerous to collapse and people are not allowed to go there for safety reasons. Unfortunately, it is a disappearing natural object and the collapse of the cave is part of natural processes that have been accelerated by vibrations caused by human activities (transport, construction).