Xiao Yuan concocted the same method, solved the other shield worm, and ended the battle here, his body was covered with insect blood and insect flesh, but he grinned endlessly.

At the same time, the main force led by Ye Han was still fighting fiercely with the insect swarm, and the troops advanced hundreds of meters along the passage, but there were more and more jumping insects surging over, and the pressure on the soldiers was increasing, and more than half of the ammunition was consumed.

It is impossible for the troops to fight all the way to the parapet, let alone to successfully install explosives, and at this point, it can already be judged that the battle will not achieve the intended purpose.

In this case, it was the right decision to abandon the battle and replan, or to retreat to the next best thing, and it was also a good decision to shrink the defense, but Ye Han did not have the slightest intention of giving up, and strictly ordered the troops to continue to advance.

Luo Qi and Ouyang Ping didn't understand Ye Han's thoughts at all, but soldiers only had the role of executing orders on the battlefield, and even if the orders were wrong, they had to execute them first.

In this way, the troops advanced another forty meters with difficulty, and another seven or eight meters were the end of the corridor, and if they went any further, the soldiers would plunge headlong into the pile of insects, and would no longer take advantage of the corridor to resist the enemy.

A large group of giant insects were crowded there, desperately squeezing into the corridor, if all kinds of grenades were not used up, Luo Qi would have to bombard it with a few.

Not only are there insects in front of you, but if you put your ears against the wall, you can hear the obvious digging sound, and if you don't grow your head, you also know that this is an excavator digging the wall, so even if you keep the status quo, this advantage will not last long.

Just when everyone thought that Ye Han was going to continue to advance, Ye Han shouted on the radio to stop, and then pointed to the wall and ordered Ouyang Ping: "Explode!" ”

Ouyang Ping didn't say a word of nonsense, and directly blasted the wall with explosives, revealing a room full of pipes and valves...... In addition to the equipment, there is also a swarm of giant insects with teeth and claws.

Ye Han, who had been prepared, waved his hand, and several soldiers rushed in with the steel bars, all of them looked like fierce generals who came out of the legendary story, and the steel bars slammed and slammed, beating the giant insects and retreating.

Ye Han walked in with a steel bar and killed the giant insect with his own hands.

Ouyang Ping followed Ye Han in, looking around curiously, not knowing why Ye Han was not allowed to shoot here, and then, his eyes fell on a set of pipes fixed on the ground, on which there was a sign strictly prohibiting fireworks.

Just when Ouyang Ping was stunned, Ye Han had already killed the last giant insect with the soldiers.

Ye Han walked to the valve in the middle of the room, let out a long breath and said: "All attention, attack with all your strength, cease fire after half a minute, pay attention, I am talking about stopping any form of firing, everyone retreats to the maintenance channel as quickly as possible, understand?" ”

"Understood!"

"Good!" Ye Han turned around and found Ouyang Ping, pointed to the valve, "Ouyang, the time bomb, the kind that can be detonated remotely." ”

"Yes!" Ouyang Ping immediately complied, and when he loaded the explosives, he saw Ye Han using two fingers as a wrench, unhurriedly twisting the simple bolts.

Ouyang Ping's eyes straightened, what the hell is going on?

Half a minute passed in a flash, Ye Han removed a section of pipe and put it aside, and as soon as the time came, he ordered the troops to cease fire, and the tide of gunfire suddenly stopped, and the soldiers ran back like burning their butts.

At the same time, Ye Han struggled to twist the valve, and Ouyang Ping immediately heard the sizzle of air leakage, and the sound became louder and heavier.

Ouyang Ping shuddered violently, and he finally realized what was in the valve - it was gas, a combustible gas!

Ye Han turned the valve a few times like flipping the steering wheel, and then ran like a rabbit with an arrow: "Withdraw, retreat!" ”

The soldiers also blew up their nests, and Fei followed behind Ye Han as if they were flying.

The two evacuated teams met in the corridor and quickly withdrew the same way, a large group of bugs following closely behind, and it was impossible to see that the troops had just beaten the swarm and could not find the north.

Running back to the storage room in one breath, Ye Han waved his hands continuously, and the soldiers struggled to push the large and small boxes, blocking the warehouse door tightly before the insect swarm rushed over.

That's not all, Ye Han ordered everyone to withdraw to the maintenance passage and cover the exit disguised as a ceiling, and then he breathed a sigh of relief: "How long has it been?" ”

Ouyang Ping said: "Forty-seven seconds!" ”

"It's a bit short...... Wait another minute! ”

Ouyang Ping asked curiously, "Captain, what is the thing released from that valve?" ”

Ye Han smiled: "I don't know, right? I also just learned that there is a coal mine under West June Fourth, and when the city was built, it deliberately broke through the rock formations to collect gas to provide fuel for West June Fourth. ”

Luo Qi couldn't close his mouth when he heard it: "This is okay?" ”

Ouyang Ping's reaction was much more intense: "No, this thing can't explode as soon as the concentration is high, it must be detonated immediately!" ”

Speaking of which, he already understood Ye Han's thoughts, that is, to open the valve and release the gas, and detonate it after reaching a certain concentration, the effect is no different from that of a cloud burst bomb, even if the insects in the North Third District do not let the explosion kill, they will suffocate because the explosion consumes a lot of oxygen.

"Hurry up." Ye Han is as good as a stream.

Ouyang Ping immediately sent out an explosion signal, but after waiting for a few seconds, there was no sign of an explosion, that is, there was no loud noise or vibration.

Ye Han's expression froze: "What's the matter?" ”

"I don't know!" Ouyang Ping panicked, and sent out several signals in a row, but there was still no response.

Luo Qi said: "Is the concentration too high?" ”

Ye Han shook his head: "Is the concentration high or not, the time bomb must be detonated, right?" ”

Ouyang Ping said hesitantly: "Or...... Shall I go out and see? ”

"There's no need." Ye Han said, "Isn't it too late now?" ”

"Yes!" Ouyang Ping nodded, "It should be that the gas concentration exceeds the standard." ”

The lower explosion limit of gas is 5.3% and the upper limit is 15%.

Ye Han frowned: "What is the result of exceeding the standard?" ”

Ouyang Ping said: "It burns when it meets fire, but I haven't seen how it burns." ”

Ye Han gritted his teeth: "Open the door and send another signal!" ”

Several fighters immediately opened the covered exit, and Luo Qi immediately shouted: "Combustible gas was found, and the concentration was seven percent!" ”

Ye Han couldn't wait to shout: "Quick! ”

Ouyang Ping hurriedly sent out a detonation signal, and a faint explosion came from the storage room.

The soldiers who opened the door were quick to close the exit, but before they let go, a huge force suddenly came from below, and the heavy lid was lifted violently, smashing heavily on the soldiers, and then a stream of flames poured into the maintenance passage, and the soldiers near the exit were either smashed by the lid or blown down by the air current.

The explosion came and went quickly, and the flames that rushed into the maintenance passage quickly subsided, Ye Han shook his head and got up, opened his throat and shouted: "How is it?" Is there something wrong? ”