So, there is a recording of a couple of sessions of a Delta Green game up at RPPR running what I believe is a home written scenario called 'Lover in the Ice':-
It would, I think, make a workable Deathwatch adventure.
The main thrust of the story is that a Green Box, a storage facility where the conspiracy dumps some of the weird **** it comes across while investigating the mythos, is compromised by a falling tree limb during an exceptionally harsh winter storm. The PCs are sent in to see if anything dangerous has been released, and if it has, destroy it.
The Deathwatch, I am sure, maintains similar installations, filled with the relics of ten thousand years of battling the enemies of the Imperium of the Emperor of Mankind. One could easily be broken open by, say, a unexpectedly severe nuclear winter unleashed by a heavy cyclonic torpedo bombardment intended to break up an enemy offensive, and the PCs could be the only ones in a position to respond.
I think the adventure makes a suitable Deathwatch scenario because 1:- exploring the Green Box to discover if anything has gone missing, and seeing all the freaky stuff stored in it, is pretty cool and 2:- the investigation that follows wouldn't be massively derailed by the PCs being eight foot supermen in glossy black powered armour, possibly because the adventure takes place in a blizzard hit city so there isn't a vast requirement to blend in with the crowd.
We can ratchet up the intensity of the storm so that even Marine have trouble getting around - no aircraft can fly and even the famed Astartes battle plate starts to have problems with the cold (naturally, millions of Imperial citizens are freezing to death while the adventure goes on, but they are not the Kill Teams brief. And only intermittent contact can be maintained with home base through an increasingly erratic astropath.
Beyond that it has the insane scribblings of a mad scribe, some decadent artists, lots of adult material to keep Slanesh happy and enough fights to satisfy even the most jaded player. Good stuff!
