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<□>□nvestigators□□earne□ t□at the gro□p □□d been friends for years, □u□□rece□tly the□e ha□□□□en tension am□ng □hem. □umors of disagreements and a□gumen□□ during the trip □□□an□to s□rface□ leadin□ a□t□orit□□□□to sp□□ulate wheth□□ foul □lay was invo□ve□. Each member□of th□ group□had a□differen□ s□ory to tell, and□the□inconsis□enc□□s in □heir a□count□ only □dded to the□myst□ry o□ □he m□ss□n□ □□ne.□□