Mysterious Doors

[Zohar_Lahar]

It is explained in the quest that we are unable to find a way to enter the last two internment hulks so, instead, we try to enter them through the aetherial curent that brought us to Dalamud's Talons at the end of the first two hulks. The actual Hulks are in The Burning Wall and The Singing Shards.

So then that just leaves Salt Strand and Boulder Downs as possible dungeons in 3.X.