While many people have tried to capture proof of Nessie with a camera (and a number have succeeded in getting pictures much like the surgeon's photo), other have used more complex equipment. Telescopes, binoculars, and movie and television cameras have all been used to look for her. A helicopter and two mini-submarines have hunted her. Sonar has also been used to try to detect her presence. Sonar is a device used to locate underwater objects by bouncing sound wares off them