The training program for Navy SEALs is plagued by widespread failures in medical care and poor oversight according to an investigation triggered by the death of a sailor last year.
A Russian vessel capable of carrying mini-submarines were spotted close to the Nord Stream pipelines days before an explosion crippled the major piece of infrastructure, a Danish newspaper reports.
The Australian government is resolute in its intentions of buying nuclear submarines from the United States, despite new revelations that two top US politicians are deeply opposed to the sale.
Russian and Chinese warships have practiced joint action in the East China Sea, continuing a series of drills that reflect a growing defense cooperation between the two countries.
China has deployed new longer range ballistic missiles on its nuclear submarines, enabling it to strike the US mainland from much nearer its own shores.
Australia's scrapped $90 billion submarine deal with France continues to impact relations between countries, amid talks of potential defence co-operation again.
French President Emmanuel Macron appears far from burying the hatchet with Australia's former prime minister, even as he poses for selfies with the current one.
The US observed Russian naval vessels preparing for a possible test of a new nuclear-powered torpedo in recent weeks, a senior US official with direct knowledge has told CNN.
US Navy SEAL candidate Kyle Mullen, 24, died of bacterial pneumonia in the hours after completing what is known as 'Hell Week', an investigation found.
The first high-quality footage of an Italian submarine torpedoed by the Royal Navy more than eight decades ago has been filmed by divers off the coast south of Naples.