In this way, under the guidance of the Duize Titan, the Kanshui Titan continued to open a small-scale water escape, and the vascular tissues that hindered the progress were frozen as small as possible, on the one hand, to make the troll not easy to detect, on the other hand, it was also to save physical energy, although this power came from the Martial God Card "Water Proof", but the power of the Martial God is not inexhaustible, before in the second layer, after Clal rashly used the deterrence of the gods, resulting in the temporary loss of the function of the Fire Titan is a good illustration of this.

Those frozen vascular tissues, and then were immediately split by the sword of the Qiantian Titan that followed closely, so with the operation, in those dense veins, gradually formed a tunnel to the depths, originally thought that if it went down, it would be extremely smooth to come to the heart of the other party, but sometimes things always backfired, just as they continued to move forward, they felt that the temperature around them was getting lower and lower, which should have been a good thing, because they had also found out before, after going underground, The temperature around me seemed to have dropped compared to the outside, and I didn't pay much attention to it at first, but now, the temperature was almost cold.

"Just now, the air conditioner was all turned on, and now it looks like the heating is going to be turned on again." This is the groove that Liema spat five minutes ago, but now, the surface of all the Titans' mechs has been covered with a thin layer of frost, and there are signs of getting thicker and thicker, and looking at the temperature displayed on the display screen in the cabin, the air temperature outside is already -23 degrees Celsius, and it continues to fall.

In this case, the surrounding dense blood vessels have become frozen at this time, and the blood in them no longer flows because they are frozen, which causes trouble in judging the direction.

"Guys, are we on the wrong track?" Claire asked in a low voice.

Miyuki also seemed to doubt her own judgment, only to see that the Titan of Duizawa stopped moving forward and began to look around.

"It's strange, since the flow of blood here has been stopped, where did the blood flow from before?" Zhou Jialiang was puzzled.

"The aorta, which is the great artery." Sayama said suddenly, "We have been coming here by opening up the capillaries, but we have never seen the other party's aorta, and the capillaries should be much thinner than the aorta, it is normal to be frozen at such a low temperature, but the aorta is different, according to this ratio, its stout should be no less than a giant freighter, so no matter how low the temperature is, it will not cause a complete freeze." ”

"So we're going to temporarily change the target of the search to find that aorta?" Liema asked.

"At least I think so, I wonder what you guys think about it?" Sayama replied.

"Rather than stagnating here like this, we'll have to try our luck." Zhou Jialiang's Thunder Titan turned around and looked at the road he had walked before, "Miss Meixing, I have to trouble you to make a new judgment and find out the location of this guy's aorta." ”

"But you can't find the aorta directly through the capillaries." Miyuki felt a little embarrassed, "I always thought that the distribution of blood vessels in this giant beast's body was not so complicated, but now it seems that it is actually no different from our human body, so to find its aorta, you must first confirm the arteries and venules that connect the capillaries, and only in this way can you determine the location of the aorta or the main vein." ”

"From the current point of view, even if we go in the current direction, we will find at most one of its arteries, not the heart." Sayama thought for a moment, "Since this place is frozen, there must be microarteries that have not been frozen, otherwise we wouldn't have been able to see the blood flowing before." ”

"And what if we go back and find a frozen vein in the end?" Billy asked suspiciously.

"So it's a matter of luck." Zhou Jialiang said, "Of course, it can't be said that it is completely due to luck, the most important point is the surrounding temperature, if the temperature continues to drop like just now, it means that there is a problem with the way you go." ”

"The direction of blood flow plus the temperature change ......" Miyuki suddenly opened her mouth after a little thought, "Okay, I see!" ”

All the Titans began to turn back, and the pause just now also gave the "Water Proof" a brief chance to recover its strength, and when it came to one of the sections of the passage that had been opened before, Mei Xing let the Kanshui Titan and the Qiantian Titan open a fork in the road, leading straight in the other direction.

Whenever the temperature drops, they will do this, in the body of the troll with no concept of space at all, everyone can only look forward to the vertical and horizontal directions through the gyroscope in the body, and after continuous attempts, it can be seen that every road opened up now is horizontal, and the previous wrong path is actually a longitudinal down, that is, the further down the troll, the lower the body temperature of the troll, proving that height and temperature are proportional.

After some judgment and fumbling, they finally saw the tube in front of them, which was obviously thicker than the previous blood vessels, the same translucent outer wall, and there was a deep blackened liquid flowing inside, but looking at its diameter, it was not as big as a giant ship as Sayama said, it could only be said to be similar to a container truck, which was obviously a certain artery or vein in the body of the troll.

But then the problem arises, they don't know whether this blood vessel is an artery or a vein, because the direction of blood flow between the artery and the vein is opposite, if it is an artery, it is necessary to find the location of the aorta in reverse, and on the contrary, the vein has to look for the location of the main vein in the same direction, only in this way can the heart be finally found.

If it is a human body, it is easy to judge, arterial blood is bright red because of the high oxygen content, and venous blood is dark red on the contrary, but the blood in the body of this troll can't see any difference at all, only that it is extremely dark, and even the specific color can't be distinguished, a bit like dark coffee and a little like dark gray or black, of course, this has a lot to do with the thickness of the blood vessels.

Faced with the problem in front of him, Claire suddenly said unashamedly: "Why don't we draw a blood test for it?" ”

"Brother, this is indeed a good idea, but we don't have any contrasts at the moment, let alone laboratory equipment." Liema sarcastically said angrily.

"Since it's a choice between two or the other, it's easy to do." Billic slipped out of his newly repaired Titan again, and after taking a breath, he couldn't help but gag, "Damn, this smells too rushing!" ”

"Boss Qi, what are you going to do?" Zhou Jialiang asked curiously.

Billic was not in a hurry to answer, but operated his bracelet, took out a piece of paper from it, held it in his hand, and smiled smugly.

"Is this ......?".

"There's only one last one left, so I'll have to save some money."

With that, he threw the piece of paper into the air and began to say something silently......