With what the Navy presumably has in the realm of underwater detection, ASW and the like, it’s a good guess the initial delay in response is due to the Navy not wanting to show their hand... perhaps?
The Navy knew within an hour something imploded. The Navy has sound profiles of the Threher imploding. Biden’s regime likely required them to keep it secret and waste all this money to overshadow the Hunter Biden charges.
Our current government dictator is a horrible creature