My host, a friendly 15-year old boy named Lazhu, takes the hot water, mixing it with yak butter, salt, and Indian tea, then churning in a big wooden tube.

In the beginning, the first attack subs consisted of a man hand-cranking away in a wood and leather suicide tube while attempting to attach explosives to a battleship using a wooden screw.

Made from a composite of polyester and marble this tube is concluded into wooden frame from American White Oak.