Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Who is an expert at hunting the crawlers? Movie plot title: The Descent 2 Movie plot: Two days after the events of the first film, Sarah (Shauna Macdonald) is washed away to safety with no memory of the events of the last time she was in the cave. She is taken to a hospital, where it is revealed some of the blood on her matches that of Juno Kaplan (Natalie Mendoza). Sheriff Vaines (Gavan O'Herlihy) demands that along with his deputy Elen Rios (Krysten Cummings), Sarah and three specialists - Dan (Douglas Hodge), Greg (Joshua Dallas) and Cath (Anna Skellern), must go back into the cave to find the missing women. A new entrance is found with the help of a sniffer dog. The team members are sent down via an old mine shaft operated by the old, mysterious Ed Oswald (Michael J. Reynolds).Whilst crawling through a narrow tunnel in the caves, Sarah has a flashback of what happened in the caves, and in a nervous panic, attacks Vaines, Greg and Elen and runs off deeper into the caves. Vaines pursues Sarah but eventually runs into a crawler and fires a shot that causes part of the cave to collapse, separating Cath from the rest of the group. Elen, Dan and Greg arrive in a room full of bones where they find the video camera used by Holly in the first film. They watch the playback, which reveals the women were attacked by the cave dwelling 'crawlers.' Then, the three are attacked by a group of crawlers and separate.The trio split, and Elen starts calling for help, alerting the crawlers to her location, but is stopped by Sarah, who warns Elen that the crawlers hunt via sound. The two then watch as a crawler attacks and kills Dan, ripping his throat open and dragging him away. Later, Cath escapes and kills a crawler and runs into Greg. The two climbing away from a crawler and using their radio to divert the pursuing crawler away from them. They travel deeper into the cave and find Sam hanging lifelessly. They decide to try to use her to swing across the chasm, but are both attacked by crawlers. Greg falls below, whilst tackling a female crawler, and although Cath makes it to the other side, she is attacked...
A:
Juno