The submarine is driving in a narrow submarine canyon, the canyon is as big as the undersea version of the Great Rift Valley, the scene is extremely spectacular, but this is not interesting to them at all, not to mention that they can't see the outside, even if they can see it, it is pitch black, they can only learn about the structure here from the reflected waves, not to mention that although their current situation is not bad, it is not much better, in this case, they have no backup, If the enemy runs out of fuel before they reach their destination, it is almost the same as declaring their mission a complete failure, unable to continue tracking, impossible to determine where the enemy is going, tossing and turning for so many days, and in the end it would be terrible if it were to end up with such an outcome.

"What else can I do now? We have no other choice but to continue to follow until we can't, no matter what the outcome is, we have to go to the end. Heavy Punch said, of course he knew that there was no turning back for them in the current situation.

"Well, that's true, we don't have a choice." The cuttlefish nodded, he knew the state of the submarine better than anyone.

At this moment, it was reported that the 8079 dry submarine had begun to dive again, and had entered the bottom of that rift.

"It's really a toss; Let's see what they're up to. The cuttlefish commanded decisively.

When they arrived, they found that they had entered an underwater cave again the day before yesterday, and the entrance of the cave was much smaller than the one they had entered before, and they could only barely enter.

"What crazy people, they're rats, aren't they? So fond of drilling holes. The ghost's head began to grow when he saw the size of the hole.

"Water rats...... Come in, there's no other choice. Heavy Punch sighed and shook his head gently, to be honest, he didn't have much hope for this trip, but it would be a pity to give up now, so he wanted to continue to follow and see if there would be further discoveries.

"Go in and have a look." The cuttlefish commanded.

The submarine slowly drove into the cave, which was incredibly narrow, but fortunately, the submarine was able to avoid the protruding rocks under the control of the autopilot system.

"If it's a dead end, I'll see how you get out." Ghost Shadow is quite dislike this kind of place, "There are only a dozen sets of heavy diving suits on the submarine, if something goes wrong, I am afraid it will not be enough......"

"It's not time to say that yet." The griffin said calmly, "Since they dare to enter, it means that there will not be too difficult places to pass inside, of course, the other possibility is that they deliberately brought us in, and then ambushed somewhere to sneak attack, but all the way was safe, so I don't think this is very likely." ”

"What if this is just a deliberate attempt to paralyze us, who didn't dare to do anything after being tracked, and who have been looking for a suitable opportunity to attack us? That's why it's been delayed until now? Ghost felt that the griffon's reason was not sufficient, and that it was full of loopholes.

"On a submarine, what do you do if you are followed by the enemy? Let him continue to follow, or find a way to get rid of him or launch a counterattack directly? The cuttlefish asked.

"I don't know, I don't have any experience in this area, but I definitely don't want to let him follow me all the time." The ghost said.

"That's right, the underwater situation is complicated, and it must feel uncomfortable to be followed, who knows if the person who is following behind will suddenly be in trouble? Who wants to walk around with a threat? Judging from their actions before, it doesn't look like they found us, and despite the possibility, I think I'm very low, and they wouldn't be stupid enough to let us follow us all the way to the present. Cuttlefish said, and it was clear that he supported the griffon's point of view.

"I don't fight with you." The ghost knows very well that he can't say anything about these two people.

After nearly six hours of long sailing, they still did not leave the cave system, but there was another completely unexpected situation, some people reported that the water pressure was weakening, which is normal when the submarine was afloat, but they had been sailing underwater, and the depth had not changed significantly, so how could the water pressure suddenly weaken? It stands to reason that they should be underwater now, at a depth of about 200 meters, and the weakening of the pressure can only mean that there is less water above their heads, but as pervasive water, how can it automatically decrease, is the environment here different from the normal marine environment?

"No other anomalies were found." It was reported.

"Although the pressure drop is not very obvious, it is really not normal, the current pressure depth is equivalent to 100 meters underwater, but our actual depth should be around 200 meters, which is twice the difference." Cuttlefish said.

"Is the meter broken? Don't just look outside, see if what's on this broken submarine has been used for too long and is wrong. The ghost said.

"No way, I'll find out as soon as something goes wrong." The cuttlefish said with confidence.

"How can there be a sudden decrease in pressure?" The ghost can't figure it out.

"Either we go up or the water level goes down, there are only two possibilities, I'm sure our depth hasn't changed, that's only the water level has fallen, but that's not possible in the marine environment, the height of the sea level won't change so much, there shouldn't be anything in the range where we can cause this, it's really very strange." The cuttlefish couldn't figure out what was going on.

At this moment, it was reported that the course of the waterway began to change and was slowly extending upwards.

"At this angle, we should be going out soon." The cuttlefish said as he looked at the data.

"I really can't figure it out! We're still in a cave, so can't we make this cave open to the sea? "Something didn't seem right.

"It's possible, maybe the exit is below sea level, not very deep." The cuttlefish said as he stared at the changing data.

About ten minutes later, the data showed that they had reached a depth of less than 30 meters underwater, because the situation outside was unknown, he did not dare to float directly, but from the feedback of various information, they did not leave the underground waterway, and after raising the front binoculars to observe the nearby situation, they found that they were still in a confined underground space, a huge natural cave in the semi-submerged water.

"No traces of the enemy have been found, the space here is very large, and the detection has not yet been completed." Someone reported.

"What the fuck is this place? How can there be such a large underwater space? We're close to the sea, is this supposed to be the largest island or near the coastline? "The ghosts thought it was strange that their speed and time should be quite far from any coastline.

"According to the depth calculation, we should still be at a depth of about 100 meters below sea level, which should not be the real sea surface, it should be the situation where the special cave structure here causes the air pressure difference, so the water level here is lower than the sea level." Cuttlefish said.

"It's a strange place to have a cave system below sea level, with water and air." Ghost finds this a bit difficult to understand.

"Continue to probe and look for targets." The cuttlefish can't think of any other way, anyway? They all had to find out the situation here, even if they didn't look for the enemy, they had to find the exit, otherwise they had to go back the way they came, but they believed that the enemy couldn't be stupid enough to get into a dead end, so there must be other underwater passages to leave here, but they entered the underwater passage in the sea for the second time, and compared with the last time, they had some experience, but they were more worried about encountering that kind of large underwater creatures.

The space of this underwater cave is very large, they can't even fully detect the internal situation, they can only grope forward a little bit along the edge, but they do not rise directly to the water, but have been in the periscope depth, the speed used to be not fast, relying on radar and sonar callback to detect the entire cave system in all directions, the computer draws a map of the cave structure according to the data transmitted back, there are countless large and small caves under the water, many of which can fully accommodate submarines in and out, but they don't know where to go, which is a bit troublesome, For a moment, they couldn't tell if the enemy had left through the caves, or which passage they were taking.

"It's a tough one, we have no direction and no way to judge." The ghosts also knew the situation they were facing, quite troublesome.

"What's the solution? So this kind of situation is all to find out the code, and then judge it according to the comprehensive data, it really doesn't work, we can only go back the same way, in this case, taking the risk is the most unwise choice, 10,000 people have entered a dead end, it will be quite troublesome. Cuttlefish said.

"It's a shame to just give up, right? At this point, we tossed and turned for many days. "The crab claws are also quite unwilling.

"Then you think of a safer way, and if it works, I'll do it." Cuttlefish said.

Crab claw didn't speak, although he felt a pity, but he really couldn't solve the dilemma in front of him, it is not difficult to get out of here, the difficult thing is how to judge the enemy's whereabouts, if you don't know which waterway the enemy has taken, then they can't break in, the internal situation of this closed waterway in the ocean is extremely complicated, and it is likely to encounter huge trouble if you rush in, and you may even never return.

"Let's not talk about other things for now, let's find out the situation first." "What's more, we're not sure if the enemy has left, this place has a complicated underwater environment, maybe they're hiding in some scanned corners, we haven't found it, or they've gone out through an obvious waterway, we haven't found it, and in short, it's not the time to jump to conclusions." ”

Although everyone understood this, almost everyone knew in their hearts that the griffon's words could only serve some comforting effect, and could not give them more hope at all.

"Keep probing and find out what's going on here." The cuttlefish knew that the morale of the army should be stabilized at this time, although low morale was inevitable, but it didn't matter, no matter what? They all have to finish the work in front of them, and no one can guess what will happen next, or what troubles they will encounter, so instead of worrying too much about those problems, it is better to start with the present.

The cave space in this ocean is very large, they can't even fully detect the depth here, but according to the cuttlefish, this kind of place cannot be compared with the depth in the ocean, but it must have exceeded 1500 meters, or even deeper, their purpose is not to detect how deep it is, but to find a way out and the location of the enemy, in the process of exploration, they found that the entire cave is full of holes, shaped like a huge honeycomb, extending in all directions, but there are not many that can accommodate submarines in and out, This is enough of a headache for them, because if the enemy leaves these caves, they simply can't make an accurate judgment.

"How does this feel like an underground ocean? There's no boundary. This fruitless probe made the ghost quite irritated.

"Strictly speaking, it's just a cave in a mountain range deep in the ocean, and it's huge, but it's a cavity formed by the air pressure and the internal structure, which makes it much deeper than the outside, more like a huge seabed rock formation, with bubbles inside." "This kind of cavity structure in the ocean is not uncommon, but it has rarely been discovered by humans, and it is a very strange marine geological structure. ”

"If we can't find a way out, we can't find a robot, do we have to find that way in and go back the way we came?" The ghost asked.

"If there is no further discovery, we can only do this." Cuttlefish said.

"That means we can toss in vain." The ghost shook his head and stopped talking.

Luckily, they didn't encounter any large sea creatures, but it felt pretty bad in the dark underwater cavern, and it felt like a huge underwater prison where no one could get out.

After a few hours, they still still didn't fully understand the whole cave, although they knew that the cave was big at first, but they didn't expect it to be so big.

Monotonous and boring probes are easy to get tired, not to mention that they are already not in the best condition, some people are starting to get sleepy and unable to concentrate, and the cuttlefish has to adjust some of the personnel to take a short rest and adjust the state, but at this time, someone suddenly reported that a new situation was discovered.

They thought they had found the enemy's submarine, or found the traces of the submarine, they could understand, but they found that it was not the case at all, whether it was radar or sonar, and did not find any information related to the submarine, but found some obvious artificial structures on the edge of the cave wall on one side......

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