The story is set in another facility, this time built in the ocean caves under Tokami Island. The facility is a combination of various mining and research opperations. There is possibly some xen portal construction work in progress. You must get out alive!
Rough around the edges, chock-full of amateur mapping and rife with a few unbalanced spots, Tokami island is still a nice romp through waves of grunts with plenty of firepower.
Just don't expect too much from this overlooked HL mod from years past.