I don’t know much about the rules of the road but I guess a vessel approaching from underneath doesn’t have the right of way? [image] Japan submarine collides with commercial ship while surfacing: report A 275-foot Japanese submarine collided with a commercial ship on Monday about 31 mile…

It is astonishing how frequently this has happened. Straits of Hormuz has seen a few incidents.

Glad to hear no one was seriously hurt. Is it not routine to use the sonar to scan vertically before surfacing? You would think submariners would be doubly cautious after Greenville collision. Interested to learn that the sub has lithium ion batteries. I wonder what its submerged range is at, say,…

With the caveat that I was a “skimmer” when serving, I don’t believe vertical sonar is available on subs. . .However, I’d fully expect that the noise from the skimmers propellers would have been VERY LOUD on the sub’s passive sonar - if not audible throughout the hull to the whole crew. SWISH-SWISH…

Point a fishfinder straight up would show a ship over your head, but not one a few miles away doing 15 knots. I think surface wave reflections would make a mess out of active sonar at a long distance looking up. The ship should be loud on the passive though.

With all the multibillion apparatus on those vessels, surely those type collisions can be avoided somehow. My pop was a “Bubblehead” and missle control dude… Wish he was still here to discuss this subject.

Can happen to anyone I guess. [image] Ehime Maru and USS Greeneville collision On 9 February 2001, about nine nautical miles (17 km; 10 mi) south of Oahu, Hawaii in the Pacific Ocean, the United States Navy (USN) Los Angeles-class submarine USS Greeneville (SSN-772) collided with the Jap…

There was one off the NE coast a while back that got into the tugs towline with bad results.

He was showing off for the “Elite” passengers that day. (Greeneville skipper)

That’s what I would have thought. And diesel-electric boats are the quietest of all vessels when submerged on battery power. I don’t recall hearing a good exploration for the American sub not hearing the ship.

[image] CoastalTrader: I don’t recall hearing a good exploration for the American sub not hearing the ship. They did hear the Ehime Maru. Here’s the NTSB take on it: https://www.ntsb.gov/investigations/AccidentReports/Reports/MAB0501.pdf Sixty pages but fascinating. Tl;dr – In its review …

Surfacing Sub Hits Commercial Vessel

Maritime News

KPChief February 10, 2021, 1:10am 8

Can happen to anyone I guess.

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Surfacing Sub Hits Commercial Vessel

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