A slow and ominous track from developer DMA Design (a respected software house who later became Rockstar and the rest, as they say, is history), this featured in the game Blood Money: the more polished successor to title Menace. Blood Money was a slick shoot 'em up with lots of well animated baddies to shoot, coins to collect and tons of upgrades. As per many titles of the time, sprites and backgrounds made as much use of 16 colours as possible and the combination makes for an excellent and challenging game today.
As for the music: on the face of it, it's a nice and simple bit of Atari ST chiptunes that belies some complex arpeggios, some nice crunchy percussion and whispy square waves. Just what you need to accompany you in your little submarine when blasting anything moving that wants to send you to a watery grave.