In the end, Chen Han put on a diving suit, and the group swam out of the submarine with waterproof, high-powered flashlights in their hands.
The flashlight beam flickered back and forth below, and Lu Yuan tried his best not to make too much noise.
Then the group began searching for the entrance within this strange underwater structure.
After a long time, suddenly the light of a flashlight came from afar.
Lu Yuan turned his head and looked over, only to see Zhou Tong pointing in the direction of his feet while shining a flashlight.
Then Lu Yuan and the others came to Zhou Tong's side.
Zhou Tong pointed to his feet, and everyone squatted down to examine the area.
There seemed to be a huge lid beneath Zhou Tong's feet, about three meters in diameter, and shaped like an oval.
Lu Yuan reached out and gently ran his hand along the edge of the lid, finally finding something like a clip under a pile of dust.
So Lu Yuan waved to a few people, and those nearby came over.
Zhou Tong took out a rope from his waist and tied it to his lower body. Then he hung a balloon on the other end of the rope.
Then Zhou Tong held his breath, removed the connector from his oxygen cylinder, and placed the balloon's nozzle in front of the oxygen cylinder.
As Zhou Tong turned the switch on the oxygen cylinder, the balloon immediately began to inflate.
Zhou Tong stopped operating the balloon after it had inflated to about 30 centimeters in diameter.
So he let go, and the balloon shot upwards like an arrow.
Lu Yuan nodded, then pointed upwards, and everyone swam towards the surface of the water.
Once on the surface, everyone gasped for breath. Although there were oxygen tanks below, the depth of over 100 meters made it difficult to breathe. Fortunately, the protective suits they wore had strong pressure resistance, so it wasn't too uncomfortable.
After everyone had caught their breath, Lu Yuan said, "Everyone, that place down there should be the entrance to this water prison! Let's think of a way to open it!"
Everyone nodded and began to ponder.
Zhou Tong thought for a moment and said, "I don't know what's going on with this water prison down there. If we open this lid too easily, won't all the water inside rush into the water prison?"
Lu Yuan nodded: "Very likely! The water pressure outside is so high, if the people inside don't have diving equipment, they could die instantly if the door is opened!"
"That's right, so what should we do? Do we really need to pump the water?"
At this moment, Chen Han, who was standing to the side, whispered, "Actually, I have a way!"
Everyone couldn't help but turn to look at the other person: "What's your good idea?"
Chen Han said softly, "Doesn't Lu Yuan have a way to get rid of people in the blink of an eye? Why not use that method!"
Lu Yuan looked at the other person: "That's right, that's a good idea! But we don't know how many people are in the water dungeon! Do you have any way to contact the people inside?"
Chen Han shook his head with a wry smile: "If I had a better way, I wouldn't have sent a submarine to search for them!"
Lu Yuan sighed and remained silent.
Suddenly, Lu Yuan had an idea: "That's it! This water dungeon is made of brick and concrete, isn't it? If we knock on it from the outside, won't they be able to hear us from inside?"
Zhou Tong nodded: "That's right! I just checked this water prison and found that it should be possible to transmit sound within it!"
Lu Yuan was overjoyed: "If that's the case, why don't we use sonar equipment to communicate with them!"
Everyone looked at Lu Yuan with surprise, wondering how he could use the sonar system to communicate with the people inside the water prison.
"That's right, secret agents usually use Morse code, right? If we tap the wall rhythmically according to the frequency in Morse code, as long as Lin Qi isn't dead, he'll definitely be able to hear it!"
Chen Han's face showed a look of sudden realization: "That's right! Lin Qi told me before that if we can't communicate, using Morse code is the best way! Although this method is very old, it is very useful!"
Lu Yuan immediately decided that everyone should return to the submarine and then use the grappling hook inside to break down the water prison.
After resting for a while, everyone returned to the submarine.
Chen Han manipulated the grappling hook to reach the wall of the water prison, then turned to look at Lu Yuan.
Are you ready?
Chen Han nodded: "Ready!"
"Let's begin!"
Then Lu Yuan took out his phone, looked at the Morse code that had appeared on the screen, and read aloud: "Beep, beep, beep..."
So, Chen Han manipulated the grappling hook to tap the wall once, then tapped it twice quickly, and then scratched the wall with the grappling hook.
They used this method to begin communicating with those inside.
Lu Yuan didn't know if this method would work, but it was the only method they had at the moment.
Zhou Tong kept his eyes glued to the sonar, and everyone else held their breath, afraid that their voices would affect the sonar's detection performance.
Then Lu Yuan continued searching for the information he needed and began reading it to Chen Han.
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