One Thousand and Fourteen Sound Source

"Something's going on!" Without thinking, the programmer shouted on the radio, reminding everyone that this was not an accidental trigger, but a real alarm.

Several programmers determined the direction of the sound source as quickly as possible. Just as they determined that the sound source was on the left side of the Dead Sea, a similar sound source was found in the direction of the South China Sea on the other side and triggered an alarm.

It's not an accident, it's definitely not an accident, but another counterattack by the enemy!

Ye Han's heart was filled with alarm, and he yelled at the top of his voice: "Attention, all units, guard against it--"

His attitude was unprecedentedly solemn. The aliens were good at digging holes, and it was not surprising that they dug tunnels to get close to the base, but the last wave was still a ground attack, and this wave was changed to underground, which meant that the enemy was very clear about the advantages and disadvantages between the enemy and us. The reason why they chose to dig underground was probably to resist the bombardment!

No, it's not just the bombardment, there are also air strikes from warships. As long as they hide underground, they can avoid human heavy weapons, thereby greatly reducing the casualties of the noble army!

Plans are not as fast as changes, and Ye Han made a quick decision in his mind: "Regiment 1 and Regiment 2, the troops will temporarily postpone their departure!"

"Regiment 1 understands!"

"Regiment 2 understands!"

"Monitoring team, report the latest situation at any time!"

"Yes!"

After issuing several orders in succession, Ye Han let out a long breath, glanced at the satellite map, and suddenly felt an indescribable irritation in his heart.

The enemy came too fast!

It's not that Ye Han hadn't thought about this situation at the moment, but it was precisely because he thought about it carefully that he was more aware of the hidden worries behind the attack.

If you think about it carefully, it's not difficult to find that when the monitoring network heard the abnormality underground, the enemy's position was not far from the encirclement.

It's true that aliens are good at digging, but if you want to dig out of the visual range of the defenders and dig under their noses, you can't just dig to get there. This means that the enemy's digging operation has never just begun. According to Ye Han's estimation, I'm afraid that the digging has started before the last round of attack ended.

If there is no need to dig tunnels, would the attack of the noble army have already started?

The coalition forces of humans and the resistance organization landed successfully. It would be strange if the noble army was not anxious. It is not surprising to launch continuous and continuous attacks on the base.

But the premise of all this is that the coalition forces must defend the base strictly. If they do not step out of the base, the landing coalition forces will make the noble army feel like a thorn in their throats. They will not be able to sleep unless they eliminate the coalition aliens.

But what is the current situation? The main force of the servant army broke through the siege of the noble army and took the initiative to attack as soon as the coalition forces landed; the noble army surrounded them and was annihilated by the defending coalition forces; all the underground bunkers inside the base were blown up; the troops of the base group have already entered the interior of Ganymede!

To put it bluntly, the coalition forces have already gained a foothold on the surface of Ganymede, but have not shown any intention to continue to develop underground. At this time, the first target of the noble army should be Albert's landing troops. Even if the noble army is not short of people and does not need to withdraw troops from the vicinity of the base, it should first deal with the main force of the servant army that is advancing bravely.

The noble army has indeed been trying to stop the main force of the servant army, but the effect is limited. No matter how you look at it, the top priority is to concentrate more superior forces to defeat the main force of the servant army in one fell swoop.

But the noble army chose to attack the base!

So what is the intention of the noble army? Cut off the retreat of the main force of the servant army? Cut off the support of the base to the servant army? Or do they have other ulterior motives?

Ye Han was very troubled. If he couldn't find a reason, he couldn't accurately judge the intention of the enemy. Now all he could do was to stop the enemy and cover the water.

So after careful thinking, Ye Han issued a new order again: "First and second regiments, I am number one, I order you to organize people immediately, place nuclear mines outside the encirclement, pay attention to keep a distance, and execute it."

Although Ye Han's order did not explain the reason, Xiao Yuan and Bian Ge realized that Ye Han was targeting the enemy digging underground. The two agreed in unison and immediately arranged people to execute the order.

Soon, more than a dozen squads operating in units broke out of the encirclement and laid nuclear mines about 1,300 meters away from the encirclement.

And there was a sufficient safe distance between any two nuclear mines.

As long as these mines were detonated, the vibrations generated by the explosion would not destroy the enemy's underground transportation network, but at least it would cause some trouble for the enemy and delay the follow-up troops.

Just when the various squads were busy, Ye Han suddenly received a report from the monitoring team: "No. 1, an abnormality was found outside the Dead Sea, the sound source is 20 meters deep, the distance is 40 meters, the depth is rising, and the speed is very fast!"

Before Ye Han could speak, the monitoring team reported again: "Outside the South China Sea, the sound source is 18 meters deep, the distance is 75, and it is digging upwards!"

"Inside the Sand Sea, the depth is 14 meters, the distance is 55, and it is digging in parallel..."

Ye Han was a little stunned. Why didn't there be any movement before, and suddenly there were so many abnormal sound sources?

How could he know that this was actually the result of the monitoring team completing the optimization combination of the monitoring program and improving the monitoring efficiency.

The continuous reports from the monitoring team made Ye Han realize that something was wrong. He quickly called up the base map, where the monitoring team had marked the locations and digging directions of all the sound sources.

He immediately noticed that the distance between all the sound sources and the warship was within 100 meters, the depth was within 20 meters, and the direction of all the sound sources pointed to the warship!

Ye Han immediately became alert: "Attention, all units, prepare for battle!"

The satellite picture could only show the ground, and the enemy moved underground. Ye Han could no longer control the battle situation as before, but this picture showed the underground situation in front of Ye Han, giving him a new basis for judging the enemy's situation.

At this time, each team that went out had completed the minelaying mission. If the sound source was not too close to the battleship, he would have detonated several nuclear mines immediately to give the enemy some color.

Just after the order was issued, the monitoring team reported again: "Report, the sound source No. 4 in the direction of Shahai has disappeared!"

Ye Han suddenly had an idea: "Where did the sound source disappear?"

"Thirty meters outside the Shahai, with a depth of six to eight meters."

Just as Ye Han's eyes fell on the location where the sound source disappeared, the voice of the monitoring team appeared again: "Report, the sound No. 2 in the direction of the Dead Sea disappeared, the distance is 26 meters, and the depth is six to eight meters!"

"Report, Nanhai..."

"Report, Red Sea..."

All the reports were similar: the sound source disappeared, the distance was within thirty meters, and the depth was six to eight meters!

Ye Han almost heard the alarm in his mind, and he immediately shouted on the radio: "Everyone, pay attention..."

As soon as he shouted these words, more than a dozen earthbags suddenly bulged out from the outside of the Shuhai. There were also earthbags bulging in other directions, seven or eight at the front and rear, and about ten more on the inside. The noble army had not yet emerged from the ground. , just put on a posture to surround the Shuhai!