The qualities of a submarine

I am not sure if the children who grew up to be October 1973 people like Mr. Phumtham, have seen the four submarines of the navy, Machanu, Sinsamut, Pirun, Phlai Chumphon or not? My generation, navy class 09 (1966-1968), saw the two Phlai Chumphon and Matchanu ships. At that time, we couldn't dive anymore. We saw the rust-colored ships floating in front of the Royal Thai Navy Dockyard. สล็อต