Submersible infrastructure
The submersible infrastructure was an underwater facility where the Xindi weapon was built.

In early 2154, the submersible infrastructure was discovered by Commander Charles Tucker III and Ensign Travis Mayweather while they were in a Xindi-Insectoid assault shuttle that they flew to the location from . The facility contained the Xindi weapon at that time, nearly completion and surrounded by craft such as Xindi-Aquatic scout ships and Xindi-Insectoid patrol ships. However, when Captain Jonathan Archer visited the area a few hours later, taking the Xindi-Insectoid craft on a return journey there, he found the submersible infrastructure was empty. ()

See also 
 Xindi launch platform

Architecture