Neptune's Hall - Large Flooded Chamber - Raising the Water Level Again
After raising the water level once and dropping through the large hole near the entrance, as described in the previous section...
Swim to the surface and have a look around. You're now in a large chamber with a large, ornate grate in the floor. Notice the blue crystal below. That's our goal, but of course we'll need to face some trials to get it. Face the archway with the carved stone face above it. To the right of the arch is a small opening at floor level. Swim inside...
...and pull the lever on the left wall...
...to raise the water level once more.
Swim back to the main room and return to the surface. Now you can get to the three doorways that were too high to reach before. All three doors lead to separate sections of the same tunnel.
Go through the door on the right to get a Vector clip (3).
The middle door has a large health pack (4).
The left door leads to a water-filled opening in the floor. Drop into that opening...
...and swim down then forward along the curving passageway.
There's another large health pack (5) on the bottom of the passage. (You may have noticed it behind the bars.) Return to the previous opening for air if necessary. Then continue along this tunnel...
...to another square opening in the floor.
Swim straight down and retrieve another large health pack (6). Then turn to face the broken bars and swim through the hole at the top.
Continue forward then upward to an air pocket. Quick-save again if things are going well. The next section will be the most difficult part of the no-damage run.
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