Canada–Nova Scotia Offshore Area Occupational Health and Safety Regulations — 172
ed as if it were pure oxygen; (o) if a remotely operated vehicle is deployed while divers are in the water, there is a dedicated and continuous means of communication between the dive supervisor and the vehicle’s pilot and a monitor at the dive control station displays the same picture as seen by the pilot; (p) if a dive is being carried out from a dynamically positioned vessel, (i) the vessel is equipped with (A) an indicator that continuously displays its station keeping status, (B) a visual and audible alarm system that warns of station keeping status changes, and whose alarms are visible and audible on the bridge, at the dive control station and in any other location where knowledge of such a change would be important for ensuring diver safety, and (C) a fixed means of communication between the vessel’s bridge and the dive control station and between the dive control station and the dynamic positioning control station that is capable of working even in the event of a total loss of power to the vessel, and (ii) there is a dedicated and continuous means of communication between the dive control station and the dynamic positioning control station for the duration of the dive and employees at each station inform those at the other station immediately of any changes in operational circumstances; (q) divers’ breathing patterns are continuously monitored and their activities continuously observed and recorded for the duration of each dive; (r) every diver’s location in the water is continuously monitored for the duration of each dive; (s) effective means of assisting and recovering divers are available for the duration of each dive; (t) any dive during which a diver loses thermal balance or there is a failure of a thermal control system is immediately suspended and all divers are returned to the diving bell, if safe, or to the surface, even if the loss or failure is expected to be temporary; (u) decompression is carried out only in accordance with the applicable decompression table identified in the dive project plan, except in extenuating circumstances and in consultation with a specialized dive physician; (v) no diver travels by air within 24 hours after a dive or while suffering from decompression sickness, unless approved by a specialized dive physician; and (w) the medical report associated with each diver’s certification under paragraph (d) is readily available, in the case of an emergency, to members of the dive team who hold a diving medical technician certificate and to the specialized dive physician referred to in paragraph (e), in an official language understood by that physician. Surface-supplied diving (2) If the diving operation involves surface-supplied diving, the dive contractor must also ensure that (a) there is, at all times, at least one member of the dive team who holds a valid diving medical technician certificate and is not on a mandatory rest period on the surface and readily available to provide assistance to the divers; (b) medical checks are carried out by a member of the dive team who holds a diving medical technician certificate, or by a medic under the direction of the specialized dive physician, on each diver at the beginning and end of each shift during which they dive; (c) except in the case of an emergency, each standby diver has had 12 consecutive hours of rest since their most recent dive and has no residual inert gas in their tissue as calculated in accordance with the applicable decompression table set out in the dive project plan; (d) no dive is carried out at pressures greater than 50 msw or if the partial pressure of oxygen exceeds 1.4 ATA; (e) sufficient double-lock deck compression chambers that have an inside diameter of at least 1.524 m and that can accommodate all divers who need to undergo decompression at any one time, as well as all other persons needing to be in the chamber with the divers to carry out the decompression procedures or provide medical care to them, are available at