Such information, when sent by the master of the ship by means of radio, shall commence with an indication of the nature of the danger to which it relates and shall be preceded by the safety signal consisting, if the information is sent by radio telegraphy, of the group TTT in the Morse Code, repeated 3 times, with the letters of each group and the successive groups clearly separate from each other, or if the information is sent by radio telephony of the spoken word “ SECURITE “ (pronounce “SAY CURE-E-TAYâ€) repeated 3 times.