□p>Invest□gators learn□d that the group had□been f□iends□□□r years,□bu□ r□cently there had □een tension among them□□Rumors of d□sagree□□□□s and□ar□ument□ during t□e trip □ega□ to sur□ace, leadi□□ aut□orities□to□speculate whe□□e□ □□□l p□□y was invol□ed. Ea□h □ember of□□he□group□ha□ a □if□e□ent □to□y to te□l, and the in□ons□ste□c□e□ □□□their□accounts o□ly a□ded to t□e myste□y□o□ the m□ssing nine□