<P> Kate decides to swim up to communication range so that she can tell Taylor about their low air as well as Lisa's predicament . She succeeds and Captain Taylor tells her he is sending down some air tanks and the Mexican coast guard is an hour out . He also warns her that the second tank may cause nitrogen narcosis which can lead to hallucinations . Kate finds the air tanks just as her original tank goes empty . She also finds the three flares for them to use to signal the coast guard . </P> <P> As she returns to the cage, Kate is attacked and dragged away by a shark . Lisa, still pinned and running low on air, uses the spear from the spear gun to pull the tank towards her . In the process, she is cut by the spear on her hand . She attaches the new tank, and shortly after doing so, she hears Kate communicating with her over their radio; Kate is injured and low on air, and the blood is attracting more sharks . Lisa states she will find her, and uses her BCD to lift up the cage, freeing her leg . After Lisa finds Kate, Taylor informs them the coast guard is still some time out and they need to get back in the cage . Lisa adamantly refuses due to the nature of Kate's wounds, and they decide to swim to the surface . As they begin to swim up, they use one of the three flares to scare the sharks . At the 20 - meter mark, they are reminded by Taylor they must wait five minutes for their blood levels to acclimate . During this time, the first flare burns out . Reaching for the second flare, Kate drops it . Lisa lights the third flare, which reveals the face of a shark . The sisters are now surrounded by them and must rush to the surface . </P> <P> Taylor yells for them to drop their gear and make a break for the surface . They swim as fast as they can to the surface near the boat . As they cling to a life ring to get to the boat, one of the sharks bites Lisa's leg and pulls her back down to the water . Lisa fights the shark by hitting it and gouging its eye out, which causes the shark to release her . Captain Taylor and the other men are able to pull Lisa and Kate onto the boat and begin administering first aid . However, as Lisa stares at her hand on the deck of the boat, it is revealed that she has been hallucinating for some time due to the excess nitrogen in her blood from the air tanks . Her leg is still trapped under the cage on the ocean floor as she laughs and imagines that she is talking to Kate on the boat deck . The coast guard comes to rescue her and carries Lisa to the surface without Kate . Lisa, as she is slowly and cautiously being brought to the surface, comes out of her hallucination, and also notices her sister is not with her . She starts to cry and call out to Kate, realizing that Kate had been dead since the shark attacked and dragged her away . </P> <Ul> <Li> Mandy Moore as Lisa </Li> <Li> Claire Holt as Kate </Li> <Li> Chris J. Johnson as Javier </Li> <Li> Yani Gellman as Louis </Li> <Li> Santiago Segura as Benjamin </Li> <Li> Matthew Modine as Captain Taylor </Li> </Ul>

Who died in the movie 47 meters down