The Cryptic Note

Found in the foreman's office of Kolanos Mine, this letter does not make any sense.

Dfsdofohwcbg tcf hvs bslh dvogs ct cif dzob vojs qcadzshsr, obr ks ofs uwjwbu hvs cfrsf tcf ozz gwhsg hc fsrcipzs hvswf sttcfhg. Aoys hvs bsqsggofm qvobusg hc mcif cdsfohwcb og ks vojs dfsjwcigzm rwgqiggsr. W kwzz ps hcifwbu hvs chvsf zcqohwcbg ghofhwbu bslh kssy hc sbgifs fsorwbsgg. Wbhsfzcdsfg vojs sasfusr tfca hvs Qwhm ct Jsfb. Hvsm vojs bch qoiuvh kwbr ct cif dzobg msh. Vwfs acfs uiofrg obr aoys gifs hc igs hvs doggqcrsg. --A