*Spoilers* The Past and After the Endwalker MSQ End

[Lurina]

On a different note, in-universe, I don't think anyone actually knows that the 8th calamity world survived.

We got a message in a bottle from them during The Rising 2019, so the WoL could tell people if they could, you know, use their mouth.

[Jandor]

We got a message in a bottle from them during The Rising 2019, so the WoL could tell people if they could, you know, use their mouth.

I snuck this letter on board a certain apparatus before it was sent hurtling backwards through time and space. As it wasn't accounted for on the storage log, I could begin to calculate where─and when─it will eventually arrive.

Even if I were to succeed in sending it two centuries in the past, the odds that it will safely reach the hands of that hero of legend are infinitesimal at best. And yet, the chance is not zero, and it is in remote possibility that I place my hopes.

My ancestor─the first of the name I now proudly bear─once told me that the hero he befriended was, for all of his many talents, above all a man possessed of great fortune. Fortune that suggested that the Twelve themselves truly did smile upon him.

In that sense, it's not unreasonable to expect that it is indeed you who is reading my words today. And so, I say: thank you, my friend. Thank you for saving our past, and giving us hope for a brighter future. And above all, please look after him, won't you?
Yours,
Biggs, Third of His Name
Eighteenth President of Garlond Ironworks

As wholesome as it was, I don't think it really confirms they survived. It reads like it was sneakily sent along with G'raha and the tower to me.