These are our most capable subs.

Not good

The Los Angeles class SSN's are still pretty capable but they are nearing the end of their service life.
Will be interesting to hear what they hit, if it's ever determined.

On purpose

and the most likely culprit would be of Chinese origin.

Or more likely a crazy Wang Lei.

and hit an uncharted object.

likely.

international waters as China is trying to "own" that region?

International waters belong to no one, so to everyone. If you don't exercise freedom of navigation, you can lose the right through default.

Submarines, be definition, are supposed to remain undetected and could not demonstrate anything.

have a change of command.

Submarines are technically ships, but they are traditionally referred to as boats. As they developed into larger vessels - and rightfully should have been called ships - the original term stuck.

They are technically ships, but the term has stuck around.

I can assure you they call them boats.

I toured the Bluefish in the late 70's early 80's,while it was tied to our outside, Ashdod Israel. I can most assuredly confirm the usage of the noun "boat", after meeting the Ex O at the doorway of HIS CABIN IN HIS SKIVIEES WRITING A LETTER. I was so shocked at not just being in officers country near midnight, both of us mildly tipsee, and as clear as a bell I still remember the Ex O's, (remaining seated of course) his big smile, and saying welcome onboard "our boat"..

A destroyerman, hell nearly any surface sailor keeps a wary eye on the Ex O. They are always the skipper's ramrod, and if you step over a line, rammed by him you will be. Submariners are a different breed altogether.

an ex COB that now works for NAVSEA, who I have worked with for years, needed something from me and I told him he had to check something first. His reply was..."I'll go put eyes on the boat."

I don't know how well I would do on a Tin Can LOL.
I have never been in the Navy but have worked with the submarine fleet for 20 years.

Yeah buddy, tin can sailor to the bone.

If it was a part of the ocean floor or a surface ship they should have detected.

If they hit another sub acting aggressively then probably not.

It had to be something with some mass to throw the crew around.

when said objects were Soviet missile boats.

This actually happened a few times, though I was stating this tongue in cheek as a "great way".

relying on charts to highlight seamounts while running slow and quiet.

Not all oceans are charted fully, and this is likely another bathymetry failure we have missed much like the USS San Francisco (SSN-711) collision in 2005.

I hope no one was injured on the other vessel

that China has, perhaps one is not return to port.

First they come jackin around our aircraft carriers with their "chicklet" scout craft, now they getting bold.

Take out their undersea bases! Then take out their homeworld! Show them we mean business.