In the middle of the night, raging winds and showers washed the whole world. The earth was shrouded in darkness, and only the surrounding ridges made of steel faintly shimmered with fluorescence formed by radiation, like the ghost fire in the legendary hell, dotted and flickering.

In this dim environment, where visibility was almost non-existent, a heavily armed force was quietly hurrying through the darkness, rapidly approaching the distant Prima Mother Tree, which was like a lighthouse and lit up in the dark night.

"It's a behemoth, and any noble tower is nothing compared to it."

After hiding in a col at the foot of the Mother Tree of Prima, Ansel looked up in amazement at the Mother Tree in front of her, which was so huge that it was to the limit. At this moment, he could hardly describe his inner feelings. The most visual impact of witnessing the majesty of the Mother Tree is hundreds of times stronger than that of any mountain.

Leona is right, this is a castle, a huge fortress built by microorganisms over thousands of years, an architectural marvel that has never been seen before in the history of human architecture.

Similarly, others felt similar to him. With an altitude of nearly 10,000 meters and a vertical height of more than 6,000 meters, it covers an area of 20,000 square kilometers. The feeling of these numbers on paper is completely different from the feeling of witnessing them, and when they actually stand in front of them, everyone feels as small as ants, and this feeling is like witnessing the vastness of the planet when traveling through the atmosphere for the first time on a space shuttle, which is completely indescribable.

"Lee, Luther, Mario, you are in charge of the vigilance. Xiazuo, you're in charge of executing the plan to blow up the bunker. The others immediately unloaded and changed into wetsuits! ～”

Robin, as the commander of the entire army, was the first to wake up from this shock, roaring through the communication channel and issuing a series of military orders.

Awakened by Robin's roar, the entire force immediately sprang into action. Lee, who has the 'Eagle Eye', immediately activated his special ability and climbed to the nearby commanding heights to take charge of the guard. Luther the Blue and Mario the Green were in cover, one in front of the other and one behind the other, occupying two positions below Lee.

Xia Zuo, who served as the demoman, quietly approached the Mother Tree of Prima, carefully avoiding the moving searchlight above, and found an undetectable blind spot, and activated his special ability 'Air Blast', which is similar to the Directional Blast.

Compared with the directional blasting formed by explosives, Xia Zuo's 'air blast' has stronger penetrating power, and because its principle is to compress air locally and make it expand rapidly, the 'air blast' has almost no sound transmission, and it will not produce a huge roar like directional blasting, which plays a crucial role in whether the troops can quietly infiltrate Prima City.

'Bang! ～’

After a small explosion, the high-speed swirling air flow easily pierced the nearly two-meter-thick shell of the Prima mother tree, creating a hole with a spiral incision. Immediately, a large area of yellow-green viscous liquid splashed out of the hole, emitting a faint fishy smell like the blood of some kind of insect.

As Leona had anticipated, the liquid in the Mother Tree was not pure water, it was more like a diluted jelly, and its adhesion made it not form a huge thrust under the pressure like water, but instead of flowing out of the hole at a slower rate.

"The hook is fixed and ready to enter." Xia Zuo, who had completed the task, turned his head and gestured to Robin, who was hiding in the shadows, and Lee, who was on guard in the distance, immediately sent a safety reminder.

"Let's get started! Barrick? Tabber, Barrett? Taba, you go first! ～”

As soon as Robin gave the order, the Taber brothers, who had changed into black sè diving suits, immediately jumped out of the darkness, approached the mother tree of Prima as lightly as a tanuki in the night, and relied on Xia Zuo's hook to fix the inner wall, and grabbed the rope to burrow into the gushing slime.

To some extent, the mucus of the stone tree is very similar to the composition of biological blood, and contains a large amount of sodium, potassium, calcium, magnesium, manganese, iron, copper and other fluorides, in addition, it also contains a small amount of nitrate, phosphate and other inorganic salts, so this kind of liquid is weakly acidic and has a slight corrosive effect. The purpose of having the Taba brothers, who have a special self-healing power, to be the vanguard is to test for themselves whether the liquid's corrosive ability can cause damage to the wetsuit.

"Safe, no visible signs of corrosion in the wetsuit."

Received Barrick? After Taber sent back a message using a connected data cable, Xia Zuo once again played safe sign language to Robin.

"Action! ～”

After confirming that there was no problem with the plan of action, Robin jumped out of the bunker with the equipment box containing his Type IV armor and led his troops to quickly move closer to Xia Zuo's position. Lee, who was on guard in the distance, immediately evacuated, unloading his armor and changing into a diving suit as fast as he could.

Since there was no wireless signal in the stone tree liquid, each Tiger Battalion soldier involved in the operation was connected to the communicator by a data cable. With the help of the Taber brothers, who were the first to enter it, Robin and the others entered the stone tree one by one, and immediately fixed themselves to the inner wall after entering, so as not to be pushed out of the cave again by the suction force of the cave opening.

Leona, who followed Robin as she entered, immediately took out a special instrument and began sampling and analyzing the liquid. Through the goggles' built-in shimmer exploration function, Leona discovers that the liquid of the stone tree contains countless tiny particles shaped like snowflakes, and when the liquid passes through the breach in the outer wall of the stone tree, a large number of particles will be intercepted, and quickly harden after contact with the air, using herself to repair the hole in the stone tree's shell.

"These are stone tree insects, and their special features give them the ability to repair nests. When the shell of a stone tree is damaged, they will gather in large numbers to repair the sores as quickly as possible, stopping the loss of fluid. ”

"It sounds a little bit like white blood cells." Robin mō mō the spiral incision on the outer wall with his hand, and found that in just over five minutes, the incision had been much smoother, and it was very soft on the inside, while the area where the air could be touched on the outside began to harden: "How fast are they repaired?" How long will it take to fix such a big gap? ”

"No more than half an hour." Leona looked at the instrument in her eyes and said, "The stone tree grows so tall that its shell, no matter how hard it is, will inevitably be severely weathered in the wind and sun. As a result, the castle will collapse due to extensive damage, and the speed of repair of these stone trees is astonishing, and its structure is very strong, much stronger than any kind of cement at present. ”

"What a strange creature." Robin shook his head in admiration and said with a smile: "But it seems that we don't have to worry about the storm ourselves, it's raining so hard outside, and the liquid gushing out will soon be washed away by the rain." As long as the hole is repaired quickly, it is believed that the mutants will not find out that someone has infiltrated their castle from the inside. ”

"Robin, we're all in."

When Lee, who was in charge of the palace, also burrowed into the stone tree, Anse Air immediately reported to Robin via a data cable.

"Turn on the lights and move forward! ～”

Having no longer had to worry about the lights being discovered by the enemy, Robin ordered the searchlight on his helmet to be turned on.

With the light of searchlights, the originally dim environment suddenly became brighter. Borrowing auxiliary tools such as hook and claw, more than 100 elite of the Tiger Battalion began to climb the inner wall of the stone tree under the series of data cables, and it was not until it was far away from the range of vortex suction that the leading Robin let go of the hook and replaced it with ... [This chapter is not finished, please click on the next page to continue reading!] ］