Another page of the Final Fantasy 7 Remake guide describes Chapter 10-Rough Waters. Cloud, Aerith, and Tifa fall victim to the ruse and end up in the sewers they now must escape.
- Escape to the Surface / Follow the Waterway
- Crossing the Trunk Line / To the Sector 7 Slums
- Operating the Pump
Escape to the Surface / Follow the Waterway
At the very beginning, you'll wake up and you'll be able to approach Aerith or Tifa. Your choice matters and will determine which cutscene you see in Chapter14. Then the boss - Abzu - shows up and you need to defeat this monster. This boss fight is described in a separate chapter of the guide.
After the battle follow Tifa and Aerith. Then use the lever to lower the water level. Go downstairs and open the box. You'll find a new weapon for Tifa - Feathered Gloves. Follow your companions and you'll come across a vending machine and a bench to rest.
Move on and fight monsters - scissorclaws, veterans, etc. Then you reach a dark corridor - walk through it, and in a moment you find a room with a light switch. Use it and retreat to the dark tunnels on the sides - lower the water level using the switches. Then go down the ladder below to find Key to the sewers, among other things.
After you reach the dam room, go down a ladder and use a switch next to the dam to lower the water level. Now go down to the empty tank, defeat the monsters and come out on the other side. Use the switch to lower the dam - before you go any further, you'll find Poison matter next to you. Continue along the dam.
Crossing the Trunk Line / To the Sector 7 Slums
Go down the ladders to the bottom of the tank and defeat Saghagin. Climb a ladder to the other side and use a switch next to the dam. Walk down the footbridge and you'll see a cutscene. Follow your companions, replenish your supplies in the Vending Machine, heal, and move on. The road is linear and shouldn't cause you any trouble. It's only worth a little extra time to get around the bars on the other side to get Warding Matter, among other things.
Operating the Pump
Eventually, you get to the Big Pump, which you have to use with the help of Aerith and Tifa. The procedure is simple, first with the help of the left analog stick lift the levers up, then press quickly X, and when the gauge is at the end, prepare to move the left analog stick down so that it is in the red area. Three successes and you will be able to move on.
The way forward includes fighting other monsters like Sahagin and Blugu. When you get to the ladder, you watch the cutscene and the chapter is over.