Internal waves can create pretty cloud shapes in the sky, as well as making life unpleasant for passengers on aeroplanes. And in the oceans they can be a deadly hazard to submarines.
Rescuers have released photos of the submarine wreckage, found more than 800 metres deep. What happens now?
The difficult defence portfolio has had a swift turnover of ministers in recent decades. But with great challenges come great opportunities for Peter Dutton.
The search for the Indonesian submarine KRI Nanggala faces huge uncertainties and a very tight deadline.
Though often seen as placid, turtles have been depicted as powerful, fighting animals since ancient times. One of the most famous battleships, the Korean Geobukseon, was called the 'Turtle Ship'.
Compared to China's naval ambitions, we seem slow-moving and complacent and lack the agility to keep up with the times.
Raising U-3523 wouldn't be worth the incredible cost.
Australia’s long-awaited naval shipbuilding plan has two interconnected weaknesses when it comes to sovereignty.
Wilson coined the phrase 'America First' and appealed for 'peace without victory.' But on April 2, 1917 he asked Congress for a declaration of war. The impact on American foreign policy was profound.
The entire concept of nuclear deterrence depends on the assumption that everything will always work perfectly.
We could be exploring the oceans of Jupiter's and Saturn's icy moons in a couple of decades. Here's what we need to work out.
The key battleground of South Australia has been inundated during the campaign with regular visits from both Malcolm Turnbull and Bill Shorten.
Australia's new submarine fleet will be designed for a range of different missions in our challenging maritime environment.
The decision on who would build Australia’s next generation of submarines carried just as much anticipation in Japan as it did in Australia.
Submarines possess a number of unique capabilities that make them ideal to protect Australia's interests.
The future of senator Robert Simms, one of the freshest faces in the Greens team, may hang on whether he is first or second on his party's ticket.
Like oil and water, party politics and good defence policy are presumed not to mix. And the process to buy Australia's next fleet of submarines has been all about party politics.
Industry and research spillovers could generate a benefit well in advance of the net cost of the submarine project.
The French have defeated German and Japanese bids to win the $50 billion contract to build Australia's 12 new submarines, which will be constructed in Adelaide.
The Conversation’s experts respond to key aspects of the announcement that French company DCNS will be build Australia's next fleet of submarines.