The San Remo Manual will be on the first SERP of a Google search and consists of numbered paragraphs specifically to make it easy to cite. Which paragraph numbers support the position you're stating here?
Not being familiar with the San Remo manual, a quick review says it does not contradict the 2nd Geneva Convention but it does not seem to directly address shipwrecked survivors. My read of GCII Article 18 [2] seems to clearly make this a requirement however.
My focus was on the the inhumanity of torpedoing the ship given the situation. Are you implying you disagree with this?
[1] https://www.washingtonpost.com/national-security/2025/11/28/...
[2] https://ihl-databases.icrc.org/en/ihl-treaties/gcii-1949/art...
Also not an expert. But my understanding is "all possible measures" and "whenever circumstances permit" have historically been taken to not apply to submarines. Largely because in WWII, we "ordered" a B-24 to attack a German U-boat who had "broadcast her position on open radio channels to all Allied powers nearby, and was joined by several other U-boats in the vicinity" following its "sinking of a British passenger ship" [1].
War is horrible - I wonder if it hadn't been carrying mostly PoWs and it had become more well known what the repercussions would have been.
Because it isn't "possible" for modern submarines to assist with rescue. They're pathetically unstable on the surface. Vulnerable as hell to even drones. Don't have a deck to speak of where rescues could be held. And have a nuclear reactor inside–you can't take randos through the airlock.
The only "circumstances permit" place where a submarine might be able to help is if it's operating in friendly waters, with air support and naval support close by to ensure no e.g. drones make a run for it while it's on the surface. And even then, it would be a risky operation.
San Remo which you referenced in another reply doesn't seem to go into what is required of combatants around rescues but it does say that rescuers can't be attacked [1]. That would make the Laconia argument be that I can't be committing a war crime by not rescuing survivors because I presume that I am at risk of having a war crime being committed against me.
[1] https://ihl-databases.icrc.org/en/ihl-treaties/san-remo-manu... : The following classes of enemy vessels are exempt from attack: ... and vessels engaged in relief actions and rescue operations;
This thread has many tendrils. I'm not sure what this has to do with any of my replies as I've not said, nor implied that.
> From what I've read, the practical obligation to survivors is met once the attacker is confident that some SAR team somewhere has been notified, which was the case here.
Can you point to that in San Remo which you've referenced multiple times - or somewhere if appropriate? I cannot find sections that deal with requiring the rescue, or notification of the need for, of shipwrecked survivors in San Remo - perhaps I am not using the right terms.