How could China “force” any US sub to the surface, it’s just not believable to me. Why would a detected sub not just leave the area, why would it surface?
And and Ohio in the SCS?, also seems unbelievable.
Depends on where exactly this is supposed to have occurred.
If it was within 12nm of one or China’s SCS islands or Chinese coast, then China does actually theoretically have the power for force unknown submarines to surface under threat of direct attack, because international law requires submarines to transit territorial waters on the surface and showing its flag. Some states (including China) also require prior notification and express permissions to be granted beforehand.
The following is a good and detailed summary of the legal point, with the most relevant point quoted below, emphasis mine.
In the territorial sea, a submarine is “required to navigate on the surface and show its flag.”15 This is not only a rule of conventional law but also of customary law, dating back to the 1920s when navigational laws were universally framed on the theory of surface navigation to ensure that ships conform to the accepted standards of safety to navigation.16 It has since been incorporated in the legislation of a number of States.17 This requirement, however, does not clearly entail the denial of the right of innocent passage when it is not met. Some States have interpreted it to mean that the coastal State may attack a submerged submarine because such passage is not innocent and therefore a violation of the coastal State’s territorial sovereignty.18
If this occurred within Chinese territorial waters, then the 054A would continuously ping the submarine(s) with active sonar, and the PLAN task force may well have scrambled multiple ASW helicopters who would all also be pinging the sub with active sonar via dipping sonar and/or dropped sonar buoys.
That is basically the equivalent of fighter jets locking on with fire control radars, and would be an unambiguous final warning prior to attack.
The subs would have surfaced because they were totally boxed in and had no other choice since they would have had an array of literal guns pointed at their heads. Had they tried to run, the PLAN would have been well within their rights to open fire without any more warning.
An SSN/SSBN can outrun an 054A sure, but good luck outrunning ASROC andhelicopter dropped torpedoes.
Not saying it definitely happened, but it absolutely could have.