Indonesia’s submarine search is reaching its final rescue window. What happens next?

A string of countries including Australia is continuing to assist Indonesian authorities in their search for a missing submarine and its 53 inhabitants, who will run out of air at 5:00am AEST on Saturday morning. 

The Indonesian Navy’s KRI Nanggala 402 submarine went missing on Wednesday, after it failed to re-emerge from its last reported dive in waters near Bali. 

There is mounting concern the 43-year-old vessel may have sunk too deep to reach or recover the stranded 53 crew in time before oxygen supplies run out.

“We will…