It might pay to have the PCs come across a couple of people who've been inside the catacombs. Perhaps they meet them in a nearby town. Perhaps the town's "mayor" asks the unit's medic to take a look at them. One of them has had his eyes gouged out. When the unit inquires as to who did such a thing, the mayor answer, "He did that to himself." The sightless man refuses to speak and he just grins non-stop. The other survivor babbles all kinds of weirdness about meeting the devil underground or something along those lines. Build up a sense of supernatural dread and forboding on one hand, while presenting very tangible threats (like the Spetznaz team) on the other.
You might also also want to include yet another faction just in case any of your players have seen the module before. One idea I like is a small French team sent to recover the BM so that France has a bargaining chip/leverage in the region. They're neither pro-NATO, pro-Soviet, pro-Polish, nor pro-Margrave. Could be interesting.
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