<□>Investigator□□le□rned that the □roup ha□ b□en□fr□e□ds □or□years, but recent□y□there had□been tens□on a□on□ □he□□ Rumors o□ disagreements and a□guments during t□□ trip bega□ t□ surfac□,□l□ading authorities□□□ specu□□te wh□t□er f□ul □lay was invol□e□. Each membe□ of th□ grou□□ha□ □ dif□erent s□ory to□□□ll, and the i□c□nsistencie□ in their accou□ts only □dded□to the my□tery □f □□e miss□ng nine□