Portions taken from www.CaveBiology.com

The entrance to Duncan Pond Cave is located at the base of hill near the east coast of the island. Due to past guano mining activities at this site, the cave entrance and passages within it were substantially enlarged and modified. A level roadway was cut to the 3 m wide by 4 m high entrance to allow rail carts access into the cave. Although mining of guano has long since ceased, a large colony of bats still inhabit the interior portions of the cave. Several small, shallow pools are located in dark sections of the cave.