The rhizome grows vertically downwards, extending to the lava area of ​​the mantle, and from there, more heat energy is obtained. This is the second step of the plan.

　　 Originally, there was no need for the first step, but when the two sides fought, there was lava everywhere in the stratum, and most of the rhizomes in the stratum were burned, and the remaining part was basically in the sea.

The downward-growing rhizome protrudes quickly. After all, it is only ice that hinders its advancement. When ice is added with a certain amount of hydrochloric acid, the freezing point will be lowered and liquefaction will occur. Salt is a truth. In essence, the temperature has not changed, but only the solidification temperature of the liquid.

　　 During the excavation process, the rhizome can often bump into the organic debris left over when it fought with Min, as well as microorganisms that did not die under ultra-low temperature and entered self-dormancy.

　　 This is a surprise.

The recycling of organic debris can provide Huogu with more organic materials in the current scarce environment, and the self-dormant microorganisms can be temporarily protected. After the temperature of the planet is restored, it will be spread on the planet. After all, it was promised at the beginning. Help take care of its creation.

　　 "I haven't bottomed out yet..."

　　 After digging for a long time, the rhizome has been growing downwards. Huo Gu turned around and estimated the distance. He dug down from the ice to a depth of nearly four thousand meters.

　　 Excavating in the ice layer, in addition to the obstacles of the ice layer, Huogu also faces another difficulty, that is, low temperature.

　　 The low temperature can no longer affect the cells controlled by Huogu, but it still affects the transportation of organic materials.

　　 Fortunately, it is not an unsolved solution. It is still the method of hydrochloric acid to lower the freezing point. A certain proportion of hydrochloric acid is added to the pipeline for conveying organic materials to ensure that the liquid inside will not freeze.

　　The only disadvantage is that hydrochloric acid will react with the protein being transported in the pipeline and decompose into more basic amino acids. When it reaches the end of the rhizome, it will be more troublesome to reassemble into protein.

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

　　 Breaking through the ground will be more difficult, because the density of the pressure from the ice layer above is not the same as that of the ancient times.

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

　　 Time flickered, thanks to finally seeing the sun, Huogu finally had a fixed unit of time measurement.

　　 The excavation of the ground layer ended, and when the rhizome protruded above the lava, the planet had rotated 25462 times, and had undergone 25,462 day and night alternations.

　　 The specific time it takes, Huogu cannot be precise, because the planet is different, and it is not sure whether the rotation period of this planet is 24 hours.

　　 is about 523 kilometers deep underground from the ground.

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

　　 "It seems that the guy in the last fight was not much better."

　　 Since it was exposed to a heat source, Huogu switched back to the original rhizome with better heat resistance and stronger performance.

　　 Relying on the original version of the rhizome, Huogu quickly opened a large net in the stratum, collecting necessary materials, and at the nodes of the net, re-extending the rhizome that grows toward the surface.

　　 and back and forth, the roots deep into the ground break through the surface, the tip of the roots stop growing, and bulge to form a sphere. Numerous roots extend out of the sphere to decompose and collect the ice covering the surface. After liquefaction, it is introduced into the underground cavity for storage.

The part where the earth’s surface meets the ice layer quickly cleared a void. Without the constraints of the ice layer, the sphere that expanded and contracted like a heart quickly expanded its shape. In a short period of time, it expanded from a diameter of one meter. It was as large as ten meters, and the speed did not decrease, until the sphere finally could no longer hold the creatures inside, and burst open.

　　 is exactly the cone-shaped creature designed by Huogu in the ocean of the last time.

　　 This creature was originally designed to provide the expansion of the life field, as well as the processing, separation, and storage of materials. After this further optimization, Huogu named this biological unit "Hive".

　　 will have this name because Huogu thought that its abilities and functions are very similar to the bee hive.

　　From the ground, through the power provided by the biological pump, the rhizome transports a large amount of calcium carbonate to the honeycomb. The honeycomb receives these substances and separates them into carbon dioxide and calcium.

　　 The previous liquefied water and elemental calcium contacted and reacted to form calcium hydroxide. During this chemical reaction, a large amount of heat was released as a result, and the liquid water was boiled and converted into steam.

　　 As a result, on the surface covered by ice, there is an extra heat source with abundant heat.

The calcium hydroxide, after the reaction, will be introduced into a new area where there are a lot of nerve protruding. The nerve synapses are connected to the cold-resistant photoreceptor cells on the ice layer, and they are shining in the sun. Under the conditions, cold-resistant photoreceptor cells will generate a large number of H+ ion clusters, which combine with calcium hydroxide to form calcium oxide and liquid water.

　　 In this way, a thermal cycle is established.

　　 With the first one, there will be a second one. The rhizome expands in all directions. Whenever it senses that the temperature drops below zero, the rhizome will establish a honeycomb stronghold in that place to release heat.

　　 Since it relies on the light of stars, the core temperature of the planet itself does not have to be affected.

　　 If someone can look down on the surface of the planet from outer space at this time, you can see that a black area appears on the white ice surface, and it will soon expand to a larger area.

　　They are the cold-resistant photoreceptor cells that collect sunlight. Underneath them are the ice-covered layers of honeycombs that are working and exothermic.

　　 This kind of expansion is not purposeless and wanton. Huogu still has a plan for the general expansion route.

　　The areas covered by honeycombs are mainly the equator, the northern temperate zone and the southern temperate zone. The area of ​​this area is about 467 million square kilometers.

　　The reason for this plan is because Hogu wants to preserve the glaciers of the north and south poles.

　　 The existence of the north and south poles can form atmospheric thermal circulation, which has the function of adjusting the climate and evenly distributing heat to a certain extent. To put it bluntly, it is a giant mixer that breaks up the heated air mass and makes the atmosphere of the entire planet more frequent.

　　 At the same time, the atmospheric environment will also affect the ocean, making the marine environment waters more stable, so that the planetary environment can be close to the earth.

　　 It’s not that the earth’s environment is indispensable, but Huogu’s knowledge is limited. Of all the known planets, only the earth’s ecological environment is the most gentle and comfortable.