Who is Major Dennis Michaelson from Subterranean and what is their importance? Subterranean_(James_Rollins) English & Literature Major Dennis Michaelson | Subterranean

Michaelson is the leader of the Navy Seals that go with the expedition team into the caverns. One of the members of the first expedition team that disappeared was Michaelson's little brother. Michaelson continually helps Ashley and Ben as they travel deeper into the caving system and stands by Ashley after she is blamed for the murder of Mo'amba.