The Ending Of Triangle Explained

"Triangle" begins with a brief, somewhat confusing look at Jess and her son at home and getting ready to head out for the day. The film then leaves them behind and catches up with Greg (Michael Dorman), who owns a small boat named Triangle that he runs with his friend Victor (Liam Hemsworth). Greg is taking a small group of friends, including Jess, out on the water for the day. When Jess shows up, her son isn't with her, and she seems a bit lost and confused. After a few minutes on the boat, Jess's brain fog lifts, and the Triangle takes off.

Not long after the ship departs, a massive storm rolls into the area. Everyone on board hears a distress call from another ship, but before they have time to even think about helping, the Triangle capsizes. Almost everyone manages to clamber onto the upside down ship, holding on for dear life until they see a large cruise ship named the Aeolus approaching.

Once Jess and the others jump from the Triangle to the Aeolus, things go from bad to worse. The ship is mostly deserted, but someone wearing a crude mask starts stalking the Triangle survivors. Eventually the masked stranger starts shooting and killing whoever they can, until Jess is the only one left alive. When she runs out onto the deck of the Aeolus, she sees herself and all the other survivors out on the capsized Triangle, approaching the cruise ship all over again.