Ye Han suddenly discovered that the air pressure from the ocean under the ice was actually not as high as he imagined, and the two icicles were so reluctant, and it was estimated that one more would not be able to withstand it.

However, two are enough, although it failed to block the ice cave, but the gap left is very small, and the surging air flow is greatly weakened, if the original air flow is a big river, then the current air flow is a trickle, so gentle that it is almost negligible.

Ye Han was a little worried, afraid that the air flow would not be able to withstand the icicles, and once the icicles fell, the fun would be great.

But the situation was more ideal than expected, the steam from the bottom of the cave slowed down and swirled under the icicles, and the water vapor slowly adsorbed on the ice, freezing the icicles and the ice wall together, and even the few leaking gaps were blocked by the frozen steam.

This was really a surprise, Ye Han first contacted the Thunder Mountain, confirmed that the communication was smooth, and then observed for a while, until he was sure that the icicles could not fall, and then made a gesture to the soldiers to start acting.

The fighters, who had been prepared for a long time, immediately took action, set up hangers on the ice platform that changed the path below, and continued to release drones to the bottom of the cave.

It is still eight or nine hundred kilometers away from the bottom of the cave, and the drone can't fall for a while, Ye Han waited impatiently, and called all the fighters together to study how to make the drone fall under the ice quickly.

After everyone talked about it, they really came up with a practical solution: after the ice cave is sealed, there is still a certain amount of air pressure left in the hole, and if there is air, you can use a parachute, so you don't need a winch at all, just throw the drone down.

The solution was good, but immediately some people raised objections: the air pressure in the ice cave was too low, and the parachute area was not enough, so if you throw it down, the parachute will not slow down at all.

"It's easy to do." Ye Han immediately thought of a way to deal with it, "Use a laser gun to make a hole in the icicle and let the airflow flow upward, if one doesn't work, two will definitely be able to support the parachute." ”

Everyone immediately nodded, and they all thought it was a good idea.

The solution was to come up with, but there was no preparation in advance, there was no parachute in this hellish place, and there was no replacement for everyone, and there was no way but no conditions for implementation.

"Why don't you poke the ice hole open, let the battleship send a batch of parachutes down, and then seal the hole?"

Ye Han rolled his eyes helplessly: "With that time, the drones are all in the end!" ”

"That's it!" He Lu echoed in the communication, "It's better to jump down directly with the drone, and then use the flight bag to get up, which is more convenient." ”

Luo Qi immediately agreed: "Good way! ”

Ye Han said angrily: "Go and go, don't talk to me here, what should you do!" ”

The leader of the group suddenly said: "Captain, if you put a few more eyes on the icicles, can you not use a parachute?" ”

Everyone was stunned together, and then suddenly came back to their senses, Ye Han patted the shoulder of the group of leaders vigorously: "Okay, Luo Qi, organize people immediately, what should I do?" ”

"Yes!" Luo Qi immediately replied, "Follow me a few people!" ”

"I'll go!" A group leader took the initiative to stand up.

"Okay, let's go." Ye Han nodded in agreement, and the group leader turned around and was about to leave, when he was suddenly stopped by Ye Han, "Wait a while!" ”

"Captain!" A group leader hurriedly stopped.

"So, you put the drone down first, and then hit the icicle when you're almost at the end, understand?"

The group leader suddenly realized: "Understood, understood!" ”

"Alright, let's go!" Ye Han said.

One group leader led his team out of the side hole and came to the platform at the lower path, where everyone nailed the fixing rope to the ice wall and waited for the group leader to give the order.

Unhurried, the group leader first instructed the soldiers to hang an unfolded drone over the ice cave, and then took out the laser gun and aimed it at the posture of the fixed armor above their heads to ensure that they would not deviate from the target due to the movement before cautiously firing at the icicle.

A thin laser fell onto the ice, and it didn't take long for a hole the thickness of a finger to melt.

The steam, which had long ceased to flow, began to flow again, and a faint stream of air poured out from the bottom of the cave.

But this air flow is too weak to support the drone at all.

The group leader wanted to make another hole, but after a moment of hesitation, he gave up the idea and changed to widen the hole before.

As the laser beam shakes, the holes in the icicles get bigger and bigger, and the air currents from the depths of the ice cave get stronger and stronger, gradually reaching the standard of releasing the drone.

The fighters immediately stopped a group leader, and after getting the approval of the group leader, they let go of the drone in their hands.

The drone plummeted into the burrow and quickly plunged into the depths of the ice cave...... In order to reduce the damage of the impact, the eight claws of the drone are all opened, and the upper and lower four protect the fuselage, no matter how the collision is hit, there are mechanical leg buffers.

A group of team members concluded that the falling speed of the drone was about seven meters per second, which was not slow, but it was still within the tolerance range.

The group leader breathed a sigh of relief, and after counting ten in his heart, he put the second drone into the ice cave.

After releasing seven drones in a row, a group of people stopped, looked up at the icicles on their heads, cut a fist-sized piece of crushed ice from the ice wall a few times, and threw it upwards with force, and the crushed ice rose with the air current, accurately blocking the hole in the icicle.

The airflow suddenly weakened, and the drone's falling speed increased sharply.

The group leader sent a set of control signals to the ice cave, and the drone hanging below immediately cut off the high-strength fibers, and like other drones, it became a free fall.

A group leader pointed to the icicle on his head and instructed, "Look at it, if the air flow washes the ice away, make up another one immediately!" ”

"Yes!" The fighters agreed in unison and stayed on the platform to monitor the position of the drone. The group leader returned to the side cave and reported the situation to Ye Han.

After Ye Han learned the details, it only took more than six minutes for the drone to descend to the bottom of the cave, and it would take about seven and a half to eight minutes to take the air resistance in the ice cave into account.

This speed is much faster than using a winch, Ye Han simply didn't stay in the side hole, said go, and personally led everyone to the platform to monitor the location of the drone with the soldiers.

The drone fell deeper and deeper, and the light in the lens became dimmer and dimmer, and even the night vision lens could only send back a blurry image. In desperation, Ye Han could only give the drones a signal and ask them to turn on the infrared fill light, and the image transmitted by the drone would immediately become clear.

After waiting for a while, the drone's fall time had exceeded eight minutes, but there was still no sign of the end, Ye Han muttered in his heart, not knowing what was wrong.

Could it be that the ice in this place is particularly thick?

Ye Han was thinking thoughtlessly, and a soldier suddenly exclaimed: "It's here, I see the water!" ”