Hey, betamike, could you be mistaken listening to the FM lyrics on your CD? I could swear the word is tread, not sweat, as in "Tread a little water, tread a little blood". Two other SDC fans I mentioned this to were of the same mind.
Also, does anyone remember a second verse? I found this online elsewhere (but don't remember it):
Welcome to the Mine King, welcome to the toils, welcome to the trouble beneath the earth and soil. You sweat a little water, you sweat a little blood and you might get out if the mines don’t flood. We’re in a lot of trouble, the water’s rising fast, if a flood ever started here the pumps would never last. You sweat a little water, you sweat a little blood and you might get out if the mines don’t flood
Although, that first verse is sketchy, so I don't know how much faith I have in their second verse...