"You're amazing, you're seriously amazing..." Superman made no attempt to hide the worship in his eyes. He had no idea how Batman had come up with this plan, and it had actually worked.
Although Superman still did not know what the correct process for clearing this stage was, he did know that Batman's method had definitely taken an unconventional route—and yet they really had succeeded.
"This was calculated precisely, Clark," Batman said calmly, without the slightest hint of showing off in his tone.
"From the very beginning, I observed that the water in your Water Prison wasn't seawater. That meant the place we were in wasn't beneath the Deep Sea. There wouldn't be fatal water pressure, and we could fully withstand the force of the water."
"But the water even knocked the wall down," Clark said.
"That was the wall's problem," Batman said. "The bricks on it could even be pried off by hand. How sturdy did you expect that wall to be?"
"Oh, right." Superman suddenly understood.
"I calculated the volume of the passage and the two rooms, as well as the amount of water needed to fill them. Based on the maximum drainage speed, the time required to fill the entire space was within the range we could hold our breath, so we could allow the water to fill the whole area.
"However, the drain was relatively small. If we used that drain to empty all the water in the entire space, we might already have drowned. So after the water filled the whole room, we had to shut the room doors tight. If we only drained the water from the two rooms, then it wouldn't take long before we had space to breathe."
"What if the door leaked?" Superman asked.
"The door on your side absolutely didn't