After about a minute, the merman came back, holding another breath in his arms, still alive.

「…… Excuse me, kill it, open its belly." I said, I didn't bring a knife, I couldn't kill the fish, besides, this fish feels not small, more than a meter long, I and it alone in the water, I may not be able to pick it!

"Ah, yes, yes!"

The merman unloaded the fish into eight pieces, and then handed it to me, I reached into the belly of the fish, and it was really fat, I grabbed a large handful of fish oil out, smeared it around the screw, and kept rubbing the heat, so that the fish oil melted and penetrated, and at the same time moved the wrench up and down, and when it was not long, the screw was loose, I increased the range of activity of the wrench, and after moving quickly more than a dozen times, the wrench was finally pushed by the downward force, and there was an obvious displacement.

But I'm in the water, and I don't have a focus.

"That...... Can you pick me up from behind?" I pleaded.

"Ah, yes, yes!" The merman picked me up from behind, I climbed on top of the wrench, used my own gravity, pressed the wrench down, pulled it 45 degrees, returned to the water, and then let the merman push me from behind, helping me pull the wrench all the way to 90 degrees.

After I got in place, I clearly felt that the sound of water outside the "boiler" had become much quieter.

The merman took me back the way I came, and after getting out of the boiler, I found that the river had stopped flowing, and I didn't need to hold the mermaids one by one, I could swim back to the ladder and climb the ladder up, and when I came out of the gap, I found that the water level had risen a lot compared to the original, and I had submerged the belt I had tied to the ladder before, but the merman untied me again, climbed the ladder, and delivered it to me.

It turns out that the upstream flow rate is so fast and the water storage capacity is so strong!

I thanked the mermen and told them not to go far yet, and I went down and got the wrench back.

"Ah, yes, yes!" The merman nodded, jumped into the water, and the dive was gone.

"Wow, the mermaid is so beautiful!" Bingbing sighed, "It's a pity......

"What is a pity?" I asked.

"Hee-hee, it seems...... Can't hey, hey, hey." Bingbing whispered.

People must have a special way.

The water is rising very quickly, there is a scale on the wall of the pump room, and there is a red line on the top, which is basically flush with the roof of the pump room, which should be the upper limit, I roughly calculated that it will take at least an hour for the water to rise to the upper limit.

The four of us went back to the dam first, and I walked to the edge of the dam to observe the situation downstream.

It is not that the dam is completely sealed, but the original seven drainage outlets, five of which are blocked, and only two are left, and the torrent is very loud when draining at full capacity, so the water level downstream has not dropped particularly obviously, and the "wet" part on both sides of the riverbank, that is, the traces left after the water recedes, is only about ten meters, which is negligible compared with the wide river.

This is good, so that the water level does not drop too suddenly, and the enemy sees the clues.

The big catfish is still squatting in the water, keeping looking up at this side, I signaled it to come closer, the big catfish swims to the side of the water that has been intercepted, I shouted at it: You just wait here, open the gate for a while to release the water, let's go down with the flood and directly attack the enemy army outside Wusan City.

The big catfish said that he understood, and found a stone nest in the water, entrenched in it, and recuperated.

The old man was in charge of observing the water level, and it turned out that the dam's storage capacity was far beyond my estimate, and after more than half an hour, the old man said, "Almost, my lord, if you store water again, it will easily wash away the dam, and we will have to use it in the future!"

I thought the same way, and I was worried that if the flood was too big, it would be easy to wash away the Wusan City, and the gains outweighed the losses, so I hurriedly went down to the pump room, summoned the mermaids, took me into the "boiler", and pushed the wrench back, and when I came out again, I stood on the dam and stared at it, and saw an amazing scene, the head of the flood beast had been released for about a kilometer, and everywhere I passed, the sand and rocks were flying, and the trees on both sides of the bank were uprooted by them, and the tide head looked at least five meters high!

"Old man, when the flood is small, walk along the river bank and walk back slowly, we have to go back to fight first!" I said to the old man that the current was too fast, and I was afraid that the catfish would bump him down.

"Okay, adults, be careful, and I wish you a victorious start!"