 In 2004, the Grand Caverns management requested that the Virginia Region chapter of the National Speleological Society conduct a re-survey of the cave system which had not been done since the 1930s.With completion of the re-survey in the original, commercial portion of the cave (), the cavers pushed through a passage, which led them to of unexplored cave.The total surveyed passage now stands at making Grand Caverns the 215th longest surveyed cave in the United States as of May 2008.