This was underlined in 1955 when H.M. Submarine, the Sidon was doing trials with an H.T.P. engined torpedo.
Oku kwabekwa umgca (kwaphawulwa) ngo 1955 xa inkwili iH.M. , iSidon yayisenza imvavanyo neH.T.P.i-injini yohlaselo.