His first important achievement was the sale of submarines to Greece and Turkey in the late 1880s. Calculating that if he could sell to one of these countries, then the rival country would feel compelled to keep pace, Zaharoff offered one submarine to the Greeks.
After the Greeks had purchased their submarine, Zaharoff turned to the Ottoman Turks alerting them to the new danger now emanating from Greece. To counter the perceived threat, the Turks subsequently acquired two submarines themselves from Zaharoff. In this way he managed to create a one-man arms race in the Eastern Mediterranean.
Nasty business. Nonetheless Farnborough is on my bucket list.