□p>Inve□tigators learned t□at□the □r□up had□been friends□for y□ars, □ut r□c□n□ly□there□had been tension among them. □u□or□□of d□sagreem□nts and a□gu□ents during □he trip b□gan to surfa□e, le□d□ng autho□i□ies to spe□u□ate wh□ther foul play □as involved. Each m□□ber of□the□g□ou□ had a d□□fer□nt□story to □e□□, and the i□□o□si□□enci□s □n thei□ accounts only □dded to the mys□ery of the m□ss□ng nin□.