<□>I□vestigator□ learn□d that□the gr□up□had been friends □or years□ b□t r□□entl□ th□re had □een te□□□on among them. Rum□rs□of disa□re□m□nts and a□guments during the trip began□□o sur□ace, le□d□ng□□uthorities to specula□e□whethe□ f□ul play w□s□in□olved. □ach me□be□ of the group had a d□□f□rent story to t□l□, and□□he incon□i□t□nc□es in thei□ ac□ounts o□ly□added to the □ystery o□ □he mis□ing ni□e□□