A US Naval base in San Diego was the scene of an announcement that could prove pivotal for at least the next 50 years of international geopolitics.The details of a massive deal to supply Australia with nuclear powered submarines have finally been revealed. For a price tag of up to 368 billion dollars over the next three decades, the U-S and U-K will share technology and partner in the construction of a new fleet of submarines, in the biggest single investment in Australia's defence capability in history.