The rhizome grows vertically downwards to the lava region of the mantle, from where more heat energy is obtained, and this is the second step of the plan.

Originally, there was no need for a first step, but at the beginning of the battle between the two sides, the strata were full of lava, most of the rhizomes in the strata were burned, and the remaining parts were basically in the seawater.

The rhizome that grows downward protrudes very quickly, after all, only ice hinders its progress, and after the ice is added with a certain component of hydrochloric acid, the freezing point will be reduced, and the liquefaction phenomenon will appear, which is the same as sprinkling salt on the road after the road is frozen, in essence, the temperature does not change, only the solidification temperature of the liquid changes.

During the excavation, the rhizome often encounters the organic remains left over from the fight with Twilight, as well as microorganisms that have not died in the ultra-low temperature state and have gone into self-dormancy.

It was a bonus.

The recovery of organic debris can provide more organic materials for Hogu in the current scarce environment, and the self-dormant microorganisms can be temporarily protected, and when the planet's temperature is restored, it will be sown on the planet, after all, it promised Twilight to help take care of its creations.

"I haven't seen the bottom yet......"

After excavating for a long time, the rhizome has been growing downward, and Huo Gu turned around and estimated the distance, digging nearly 4,000 meters down from the ice side.

Digging in the ice, in addition to the hindrance of the ice, Hogu also faced another difficulty, and that was the low temperature.

The low temperature no longer had any effect on the cells under Hogu's control, but it still had an effect on the transport of organic materials.

Fortunately, there is no solution, it is still a method of reducing the freezing point of hydrochloric acid, adding a certain proportion of hydrochloric acid in the pipeline to transport organic materials to ensure that the liquid inside will not freeze.

The only downside is that hydrochloric acid reacts with the proteins being transported in the pipes and breaks down into more basic amino acids, which can be troublesome to recombine into proteins when they reach the end of the rhizome.

Finally, at a distance of more than 8,000 meters from the surface of the ice, the rhizome encountered resistance, far stronger than the ice, and Huo Gu knew that it was the ground covered by thick ice.

It will be more difficult to break through the ground, because the pressure from the ice above is not the same density as it was during the Plutozoic period.

However, although the resistance increases, it is not impossible to continue to advance, but the speed will be much lower than before.

Time flew by, and thanks to finally being able to see the sun, Hogu finally had a fixed unit of measurement for time.

By the time the excavation of the strata was completed and the rhizome protruded above the lava, the planet had already rotated 25,462 times and undergone 25,462 day and night cycles.

The exact time it takes, Hogu can't be precise yet, because the planets are different, and it is not sure whether the rotation period of this planet is 24 hours.

Starting from the ground, it goes about 523 kilometers underground.

"It's 490 kilometers deeper than the last time I touched the lava field, and the temperature of the core has dropped so much......"

"It seems that in the last fight, that guy was no better."

Now that he was exposed to the heat source, Hogu switched back to the original rhizome, which was more heat-tolerant and performant.

Relying on the original rhizomes, Hogu quickly opened a large net in the stratum, collecting the necessary materials and reextending the rhizomes growing to the surface at the nodes of the net.

Repeatedly, the rhizome that goes deep into the ground breaks through the surface, and the tip of the rhizome stops growing and bulges to form a sphere, which extends countless roots from the outside of the sphere, decomposes and collects the ice that covers the surface, liquefies and introduces it into the underground cavity for storage.

The part where the surface meets the ice layer quickly cleared a hole, and without the restraint from the ice, the sphere that expanded and contracted like a heart quickly expanded its form, from a diameter of one meter to ten meters in a short period of time, and the speed did not decrease, until the sphere finally could no longer hold the creatures inside and burst open.

What came out was the cone-shaped creature designed by Huo Gu in the last Plutoic Ocean.

This creature was originally designed to provide the expansion of the life field, as well as the processing and separation of matter, as well as storage, and after this further optimization, Hogu named this creature unit 'Hive'.

The name came from the fact that Hogu thought that its abilities and functions were similar to those of a bee hive.

From the ground, the rhizomes transport large quantities of calcium carbonate substances to the hive through the power provided by biological pumps, which are accepted by the hive and separated to produce carbon dioxide and calcium elements.

The liquefied water is in contact with elemental calcium to produce calcium hydroxide, a chemical reaction in which a large amount of heat is released and the liquid water is boiled and converted into steam.

As a result, there is an additional source of heat on the surface covered by ice.

The calcium hydroxide, after the reaction, will be introduced into a new area, where there are a large number of nerve protrusions, and the synapses are connected to the cold-tolerant photoreceptor cells above the ice, and under the sunlight, the cold-tolerant photoreceptor cells will produce a large number of H+ ion clusters, which combine with calcium hydroxide to form calcium oxide and liquid water.

In this way, the thermal cycle is established.

With the first one, there will be a second, and the rhizome expands in all directions, and whenever the temperature drops below zero, the rhizome establishes a hive base in that place and performs the work of radiating heat.

Since it relies on the light of the stars, the inner core temperature of the planet itself does not have to worry about being affected.

If one were able to look at the planet's surface from outer space at this time, one could see that a black area appeared on the white ice, and it soon expanded to an even larger area.

They are cold-tolerant photoreceptors that collect sunlight, and beneath their ice-covered are working heat-emitting hives.

This kind of expansion is not aimless and wanton, and the general expansion route, Hogu is still planned.

The hive covers the main areas of warming in the equatoral, north temperate and southern temperate zones, and this area covers an area of about 467 million square kilometers.

The reason for this is that Hogu wants to preserve the glaciers in the north and south poles.

The existence of the north and south poles can form an atmospheric thermal circulation, which has the function of regulating the climate and uniformly distributing heat to a certain extent.

At the same time, the atmospheric environment also affects the oceans, making the waters of the marine environment more stable, so that the planetary environment can approach the Earth.

It's not that it has to be the earth's environment, it's just that Huogu's knowledge is limited, and among all the planets he knows, only the earth's ecological environment is the most mild and comfortable.