After you complete Abyssal Zenith in Fisch, the next step is usually to push deeper toward the Calm Zone by finishing the deep-sea upgrade path. Abyssal Zenith is mainly a progression stop where you can unlock the Deep Upgrade for your submarine and the Glimmerfin Suit Lv. 3 , which are needed to keep descending safely.

What to do next

  • Finish any Abyssal Zenith materials you still need, especially the fish/items tied to the upgrade station.
  • Turn in the materials to unlock the Deep Upgrade and Lvl 3 Glimmerfin Suit.
  • Use that upgrade to continue downward into the Calm Zone , which is described as the next major area after Abyssal Zenith.
  • If you care about completion, finish the Abyssal Zenith bestiary too; guides note it has its own set of fish and a progression badge.

If you want more progression

A lot of players use Abyssal Zenith as a checkpoint rather than an end point. The usual “done here” checklist is:

  1. Unlock the submarine upgrade.
  2. Unlock the suit upgrade.
  3. Clear the local bestiary.
  4. Move on to the next trench layer.

Small note

Some guides also mention the Crowned Anglerfish as a secret fish in this area, but it is not required for the bestiary completion. That makes Abyssal Zenith feel a bit like a hidden-workshop zone: you finish the essentials here so the game can open the deeper route ahead.

TL;DR: After Abyssal Zenith, upgrade your submarine and Glimmerfin Suit, then head for the Calm Zone.