Let him take care of it and he'll be able to access the Deep Sea Deposit without expending any RSP. When you reach level 6, approach the levers and Zell will claim he can operate the machine. On level 5, expend 1 unit to access level 6. On level 4, expend 1 unit to access sector 9.

On level 3, expend 1 unit to access sector 6. With Zell: On level 2, expend 1 unit to access sector 3. On level 6, you'll need 4 units of energy to access the next sector. When you access level 5, your choice will be limited to the sector of the same cost. When you access levels 3 and 4, your subsequent choices will be limited to sectors of equal or lesser cost. Mid-cost sectors (2, 5 and 8) require 2 units of energy and low-cost sectors (3, 6 and 9) require 1 unit of energy. High-cost sectors (1, 4 and 7) require 4 units of energy to access. Each level from 3 to 5 has three sectors: a high-cost sector, a mid-cost sector and a low-cost sector. 4 units will be spent opening the door to level 2, leaving you with 16 for the completion of your objective. Your task will be to use Reserve Steam Pressure to rotate the lower levels and gain access to the excavation site. Examine it to read the report about the Level Energy System that controls the six-level pillar structure leading to a ruin at the bottom of the ocean. Climb down the debris and you'll see a terminal buried underneath the rubble on the left side of the room. When you leave and return to the Deep Sea Research Center, you'll find a new path leading to the gaping hole left by the destruction of the core.

Keep your HP at or near maximum while you stock up on magic and mug Bahamut.When you're ready to end the battle, attack with GFs or cast Meltdown and use physical attacks (cast Aura to use Limit Breaks). Designate a medic and cast Triple on that character so you can restore your party in a single turn. It also uses an extremely powerful attack that targets your entire party called Mega Flare.

Devour ff8