If you go by Malcolm Gladwell bestseller Outliers The Story of Success, simply practising something regularly for a long enough time, one will eventually...
The lease contract was signed in July 1987 and the Indian Navy crew deputed to take over the submarine arrived in September for a refresher course as the skills had started to diminish over the intervening year and a half. The handing over process began in October and abruptly stopped as the author received an order to stop the process of transfer and stop access of foreign nationals to the submarine.