20. (1) Where a crane or other hoisting device is used to lower a stage or man basket carrying a diver into the water, each employer associated with the diving operation and the diving supervisor for the diving operation shall ensure that, (a)  the crane or other hoisting device remains available throughout the dive for the immediate recovery of the diver if required in the event of an emergency; and (b)  except in the event of an emergency, all directions to the operator of the crane or other hoisting device are given, throughout the dive, by the diver, the diver’s tender or the diving supervisor. O. Reg. 629/94, s. 20 (1); O. Reg. 32/14, s. 19 (1). (2) Each employer associated with a diving operation and the diving supervisor for a diving operation shall ensure that a diver who is being lowered in a stage or man basket into the water by means of a crane or other hoisting device is continuously able to communicate with the diving supervisor by using pre-arranged visual or line signals or a two-way voice communication system. O. Reg. 629/94, s. 20 (2); O. Reg. 32/14, s. 19 (2). (3) Each employer associated with a diving operation shall ensure that any crane or other hoisting device used in a diving operation is adequate. O. Reg. 629/94, s. 20 (3). (4) Without limiting the generality of subsection (3), each employer associated with a diving operation shall ensure that any crane or other hoisting device used in a diving operation, (a)  is of sound construction and adequate strength and is free from patent defects; (b)  is equipped with a failsafe mechanism that will prevent the boom from descending or telescoping in the event of a power source failure or hoisting system failure; (c)  is equipped with a brake or mechanical locking device that is applied automatically when the control lever, handle or switch is not held in the operating position; (d)  is equipped with brakes that can stop and hold 100 per cent of the maximum working load with the outermost layer of wire on the drum; (e)  is so constructed that any brakes that are power released will be applied automatically on loss of power; (f)  is so constructed that the lowering and raising of loads is controlled by power drives that are independent of the brake mechanism; (g)  is not fitted with a pawl-and-ratchet gear on which the pawl has to be disengaged before commencing the lowering or raising of the load; and (h)  is constructed in a way that ensures against malfunctions at low temperatures. O. Reg. 629/94, s. 20 (4). (5) Each employer associated with a diving operation and the diving supervisor for a diving operation shall ensure that any crane or other hoisting device to be used in the diving operation is adequately maintained and is examined by a competent person at least once on each day on which it is to be used. O. Reg. 629/94, s. 20 (5). (6) Each employer associated with a diving operation and the diving supervisor for a diving operation shall ensure that any cable used with a crane or other hoisting device in the diving operation is used in accordance with the Code for Cable, Slings and Rigging, dated July 4, 1994 and issued by the Ministry. O. Reg. 629/94, s. 20 (6). (7) Where a crane or other hoisting device is used to lower a submersible compression chamber or atmospheric diving system into the water, each employer associated with the diving operation and the diving supervisor for the diving operation shall ensure that, except in the event of an emergency, all directions to the operator of the crane or other hoisting device are given, throughout the dive, by the diving supervisor. O. Reg. 629/94, s. 20 (7). (8) Where a crane or other hoisting device is used to lower an open (wet) bell, a submersible compression chamber or atmospheric diving system into the water, each employer associated with the diving operation and the diving supervisor for the diving operation shall ensure that the crane or other hoisting device is equipped with, (a)  a primary lifting cable that permits the chamber or system to be lowered safely to the maximum depth of the dive and to be returned safely to the surface, without undue lateral, vertical or rotational movement; (b)  a secondary lifting cable that is, (i)  readily available at the dive site, and (ii)  compatible with the secondary lifting eye or similar device. O. Reg. 629/94, s. 20 (8); O. Reg. 32/14, s. 19 (3). (9) Where a crane or other hoisting device is used to lower an open (wet) bell or submersible compression chamber into the water, each employer associated with the diving operation and the diving supervisor for the diving operation shall ensure that, during any air-water interface transfer, the crane or other hoisting device is equipped with a safety rope that will, in the event of the primary cable breaking, cause the open (wet) bell or chamber to stop directly below the turbulent wave zone. O. Reg. 629/94, s. 20 (9); O. Reg. 32/14, s. 19 (4). Fall Arrest Systems