In the following years, cavers widened the sides of the cave and discovered new branches, leading the total extension to . In 1973, some glass slabs were set in particular spots in the cave, in order to verify the solidity of subterranean space. The slabs resisted to 1976 Friuli earthquake, showing Karst region was avoided the quake. Later, geologists and biologists achieved studies and researches on cave geomorphology and animal species living in the cavity.