Even the professionals

Two things.

1) Are you suggesting that a Sub that plans to ascend to a dept where a colission with a ship is realistic but not to the surface has different rules apply? Why would this be?

2) Do you think it is normal for our naval ships to run into one another?

FYI The Front of the Mast was damaged, and the ships were traveling in the same direction.

I read two questions and one "thing." The only formal rule that applies is that the sub is the burdened vessel.

Normal to collide with surface vessels, no. Does it happen? Yes, when subs are busy doing what subs do sometimes they go bump.

If they were going the same direction what might that tell you?

I had questions about two things, I thought you would be able to figure that out.

In both cases the sub was a burdened vessel, and in both cases the sub failed to meet the burden, the portion we are compairing is the same, hence apples to apples.

Yes it happens, but that doesn't keep it from being bizzar.

The Sub was probably hiding under the ship, I don't see how that changes much.

Pure supposition (like most of this thread): If the sub is running close below and behind the ship (which could account for the damages as stated) in a co-ordinated maneuver with full knowledge of the ship and the ship slows abruptly, for whatever reason, without notifying the sub in time for them to take evasive action who is burdened, bearing in mind that we're talking about ships of war and assuming that they are working together?

More frequent than one may think ...
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By TOM NEWTON DUNN
Defence Editor
Published: 16 Feb 2009

British and French nuclear submarines which collided deep under the Atlantic could have sunk or released deadly radioactivity, it emerged last night.

The Royal Navy’s HMS Vanguard and the French Navy’s Le Triomphant are both nuclear powered and were carrying nuke missiles.
Between them they had around 250 sailors on board.
Calls have today been made for an urgent inquiry in to the international incident.

The collision is believed to have taken place on February 3 or 4, in mid-Atlantic. Both subs were submerged and on separate missions.

As inquiries began, naval sources said it was a millions-to-one unlucky chance both subs were in the same patch of sea.

Warships have sonar gear which locates submarines by sound waves.
But modern anti-sonar technology is so good it is possible neither boat “saw” the other.

The naval source said: “Crashing a nuclear submarine is as serious as it gets.”

Thats a good point