Technical Diving allows a diver to safely exceed recreational dive limits by using advanced procedures and equipment. Technical diving may involve a physical obstruction of the surface, such as diving inside a cave where direct access to the surface is not possible. In decompression the divers are essentially “trapped” underwater for a calculated amount of time whilst de-saturation occurs. This inability to immediately abort the dive and ascend to the surface means that the diver must be capable and prepared to deal with any contingencies or problems that arise the dive.