| Zone || Level (HP) || Drops || Spawns || Notes
| Sealab Compound (Boss Room)
|| Scales to crew's CL
A = Aggressive; P = Passive; L = Links; K = Knockback
- The second part of a three-part battle against Sealab X
- Spawns when Sealab X Tail is destroyed.
- Spawns with Sealab X Body and Sealab X Left Arm.
- Sealab X is the final boss of chapter one.
- Continually fires Missiles at one player at a time.
- The third part of the battle against Sealab X is against the Sealab X Head.
- When Sealab X is defeated, you receive one of four recipes:
- Defeating Sealab X rewards you with the Victory! badge.
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