Ships with explosives on board may, at the discretion of the port captain, be brought alongside a wharf specified by him for discharge: Provided that-
(a) the work of discharging is carried out as expeditiously as possible from one hold at a time, due regard being given to safety,
(b) a hold containing explosives is opened only when discharging from that hold is about to begin;
(c) whilst explosives, except ammunition of Groups (transportation) 5, 6, 7, 7A, 8, 9, 11, 12, 13 and 15, are being loaded into or discharged from a hold no other work shall be performed on board the ship without the written authority of the port captain;
(d) the ship keeps main engines ready to move the ship from the wharf at any time;
(e) a fireman with stand pipe and hose connected stands by the whole time and, if the pressure on the mains is insufficient, he stands with chemical extinguishers ready for immediate use; and
(f) a gangway is provided at or near the hold being worked, for the sole use of the fireman and those persons directly concerned with the discharging of the explosives.
