CT-Scenery have released an Underground facility terrain set.
From their announcement:
We’re proud to announce our latest product: the Underground Facility (retro sci-fi).
We have two different game boards, who both come painted and with wooden protective edges and finishing. Separate wall blocks and doors can be placed in almost any configuration on the gaming surface.
The basic set contains 1 painted Underground Facility Board B and 1 unpainted Facility Walls kit. The board surface is composed of 12 by 15 squares of 2″ by 2″.
Check our website for more info.