And then in the Haruspex route you get a letter from Daniil almost every morning at 7:00 AM sharp, and they all read like

"My dear Haruspex,

I hope all is well and you are staying safe. There has been a new development in my research, I would like to discuss it with you at your earliest convenience because I will simply be unable to progress any further without your help. Please please please come see me ASAP or I shall wither away like a delicate violet beneath the cruel sun. I'll be upstairs at the Stillwater standing in front of my bed as usual.

XOXO

Per wikipedia:

The Titanic was made of steel, presumably to resist corrosion (i mean. thats why boats are made of steel i assume) but even when iron/steel rusts people did not expect to find like. decomposition. bacteria are EATING the titanic.

and there's wood furniture from the titanic that isn't decaying. hell, there are wood ships at the bottom of the ocean that archaeologists study. so the expectation people have for the titanic is not that the steel would decompose at the bottom of the ocean. Even in 100 years, since there are much more ancient preserved wooden ships iirc.

The sister ship HMHS Britannic is still perfectly preserved because of the way it sank, and partly in due to the coral that has grown around it keeping the structure in tact I believe was the reason.