Hello, Surf, I see you got a copy of Abe's Exoddus, congrats!
Well, here we go: in tunnel two, after Abe's buddies got sick of brew, Abe can't help them yet, beause Abe has to learn the healing chant, in the sacred vaults of Necrum.
You see, that's one of the main goal of Abe's Exoddus, just like in Abe's Oddysee, when Abe had to pass the ancient temple tests to receive the Shrykull power.
So, first get out of Necrum mines, and pass the tests in the vaults of Mudomo and Mudanchee to reacive the healing ring power, and get back to necrum mines to save your fellows (it's simmilar to what happend to Abe in the first game: you first scape from Rupture Farms, recieve the mystic powers, and get back to Rupture Farms to continue your adventure.