This is Gre'thor, which is essentially the Klingon version of Hell. The exterior gates/dock were seen in Star Trek Voyager, the interior is entirely a creation made by us for Star Trek Online. I was responsible for the creation of this map, including geometry, textures, materials, lighting, and atmospherics, with the exception of the rocks, and the rock walls on either side of the main gates, which were existing assets. In addition, the bulk of the map was built with a kit of parts I made for Boreth, with material changes applied.
Gre'thor went live with Season 22: House Reborn, in January 2021.