Provided is an underwater elevating apparatus, wherein the cable is not paid out unexpectedly by self-buoyancy while waiting underwater, excessive paying out of the cable may be prevented by a latch unit having simple mechanisms, and electric power does not be used needlessly. One method includes determining, by a network optimization client of a mobile device, a packet call quality associated with transmission of packets between the mobile device and a mobile communications network. The outer diameter of the adaptable obturator when inserted into a trocar compresses from an initial condition to a compressed condition to match the inner diameter of the trocar.