An apparatus for protecting and providing user access to a touch sensitive device underwater, comprising a waterproof casing comprising an inner cavity configured to receive the touch sensitive device, the casing comprising: a first area of the casing for providing user access to the touch sensitive device; a transparent first membrane arranged to cover at least part of the first area of the casing, the inner cavity configured to receive the touch sensitive device so that user interface of the touch sensitive device being arranged adjacent to the membrane of the first area; a pressurized non-conductive fluid arranged to the inner cavity to provide a gap between the user interface of the touch sensitive device and the membrane; a pressure control membrane arranged to cover at least part of a second area of the casing; and a pressure control element operationally connected to the pressure control membrane, configured to flexibly bend the pressure control membrane to change pressure of the pressurized non-conductive fluid.