First sub sent:
Sirensong Sea 1 - Rank 90
Sirensong Sea 2 - Rank 90
Unlocked:
A new subaquatic voyage destination─Anthemoessa─has been discovered!
A new subaquatic voyage destination─Magos Trench─has been discovered!
171 Favor

You obtain 27 chunks of pewter ore.
You obtain 25 alien onions.

Second sub:
Sirensong Sea 1 - Rank 90
Sirensong Sea 2 - Rank 90
Unlocked:
A new subaquatic voyage destination─Crow's Drop─has been discovered!
127 Favor

Gave same return of items - pewter ore and alien onions.

Sending them off again!