In the early 26th Century, Carlisle led one of the expeditions to Nemaka at the request of "Mr. V", seeking to excavate an alien artifact similar to the one found on Bhekar Ro. He theorized that these artifacts were interstellar vessels and that the energy creatures were their pilots.
Theories were one thing. Gaining access to the artifact was another and eventually, Mr. V lost patience, sending Carlisle and his team away from the planet and promptly recruiting another team. To his credit however, Carlisle managed to keep a brave face in regards to the eerie feeling generated by the artifact.