The sinking of the Titanic must have been one of the greatest offerings to Poseidon ever. amirite?

with the oceans rising, he's gonna have all the offerings he could want

Nah, better offerings would be horses. Poseidon does love his horses.

 the Titanic sunk just before the end of its maiden voyage.  It was not very close to sinking that, and the story of the Titanic's sinking is just too much of a story.

Not really.

'''
SHIP DEATHS
RMS Titanic: 1,494
MV Doña Paz: 4,386
MV Wilhelm Gustloff: 9,400
'''

And that's only for isolated incidents. In 1274, ~1/3 of a Mongol fleet sank in a typhoon while attempting to attack Japan, and ~13k people drowned. The Mongols returned in force 7 years later, and lost another ~70k souls to yet another typhoon.

More like poseidons greatest revenge for humanities efforts to build a ship that was deemed to be unsinkable.

Na, it's probably all the wars fought on sea over the centuries.

Eh no, shipwise, a better offering would probably the sister ship of Titanic, the Britannic, which sank almost in one piece (bow split from main part of ship), and was slightly larger than Titanic, while titanic split in half and was a whole mess

If they had filled it with Diet Coke, it could have been an offering to Dionysus as well

I would say Pearl Harbor? But I'm
Not a history buff, sure there are many massive naval casualties throughout history.