Steel steam and flame

The construction time of the Black Castle is inconsistent with that of Brinor. It is a landmark building built after the rise of Brinor. The underground sewer below still has a brand-new smell. There is not much rain here, and the patch of concrete above the head looks no different from the newly dried concrete block.

The beam of a strong flashlight hit one side of the waterway. The concrete there was lighter in color than the surrounding colors and was added later. The difference is very obvious in comparison, showing the shape of a gap, which is another waterway line that was later re-blocked.

Cassia tied a strong flashlight to her waist, took out the small shovel she had prepared in advance, and confirmed that there was no one else in this long waterway except herself and the running mice. Finally, he began to knock out small grooves along the shape of the gap.

This was to place the small craters used for timed explosive bombs. After discussing with Lina in the morning, Cassia decided to choose the aspect she was most familiar with and good at as the breakthrough point for this mission. Their current plan only lacked the necessary chaos. In order to ensure that the actions at the party could go smoothly, Cassia still felt that they had to add something to them. Putting all the possibilities on others, both he and Lina felt uneasy.

So after the negotiation was completed, they started from the small hotel and went to the Exchange Building first, bought Blino's detailed underground waterway map drawings, and then rushed to the Black Castle, with plenty of time. This waterway, which was half-constructed at that time and was forced to be abandoned due to concerns about the complete problems of the Black Fort, was discovered on the way here.

The Black Castle is the largest and most luxurious hotel in Brino. The people they receive are either the small leaders of a certain force or the big benefactors who come here from the gray zone or from the empire. The original designer planned to connect the underground sewer directly under the Black Castle to facilitate the discharge of domestic wastewater every day. However, considering that there was such a huge safety hazard underneath and anyone could get in through the water channel, the design was changed and the water channel of Black Fort was designed to be semi-independent, with only one interface to the urban water channel network system, and People were also assigned to guard the security level. It's almost impossible to break through there without being discovered.

This abandoned line at the time was only half-built. According to Cassia's estimation, the length may only reach the periphery of the Black Castle Hotel and not approach the core area.

But this is enough. Cassia just wants to use the sound of explosives and local vibrations to create chaos, or to create opportunities for those who are opposed to the Imperial Mining Company and the Three Primary Colors Group. He never thought about sinking the entire Black Fort. He may have had this idea in mind, but the amount of explosives he bought from the trading building was completely insufficient.

Lina is responsible for exploring places that are different from those on the panoramic map, as well as observing the number of security personnel around the Black Fort and the station, roughly judging their strength, and choosing the most suitable route to escape at night.

The pit was quickly dug, and Cassia adjusted dozens of timed explosive bombs to the same time and stuffed them all into the groove.

Hiding on the side not far away, he looked at his watch. The hour hand pointed to half past one.

"The square above must be very lively." Before the last note of the sigh could be heard far out of the waterway, a dozen directional explosive shells on the side made a loud sound on time, and the muffled sound was continuously compressed in a narrow range. As the sound increased, Cassia felt that a layer of misty air had gathered in her ears, and the sound became softer.

The square above the waterway was already occupied by a lively crowd. Brino was built on a gentle slope. The structure of the underground waterway was like a staircase, which was deeply separated from the ground. The weak movement below was completely buried in the noisy sound, and did not attract even a single person's attention.

The fat rats did not lose their nimble speed and flew through the waterway, away from the explosion site.

When the light came on again, all the mice squatting there ran away. Small pieces of blown concrete sputtered out and landed on a pile of mold-covered bones on the ground. Cassia stood there and waited for a while. There was an exit of a waterway not far away. When he saw that there was no movement there, he was relieved that no one was paying attention and walked over.

There is a lot of concrete used for sealing, and there is also a layer of hard-sintered red bricks inside. Its overall thickness is probably close to one meter. After so many years, not even a mouse has drilled a hole here. But the explosive bombs made by Rocks were specially designed to open holes in the base's protective walls, so there was no problem at all against this wall.

A large circular building block had completely detached from the wall and was very heavy. Cassia pushed it inward hard to give him a gap to enter.

"Bang"

The hard and heavy rock-like building blocks fell inside, and the dust stirred up swept back towards Cassia's face with the air inside. He quickly took a step back, and the afterglow of the bright light illuminated his surprised face.

What should exist in the forever-sealed abandoned line is endless, deep darkness and the air that smells of decay. They will be like train tracks that no longer run. They will grow rusty in the continuous cycle of the four seasons until they are washed away by rain and mixed into the soil. But in the air coming from the pavement, there is nothing except the smell of dust that has not changed for thousands of years.

The darkness is gone, the smell of decay is gone. Instead, there's even a little moisture.

A hundred meters ahead, Cassia's eyes caught a faint light. I could also feel the air on my face.

Walking inside, the ground is considered dry, and the scenery under the lights is an ordinary underground water scenery, nothing special. The end was not a piece of unexcavated soil. Cassia saw several thick red copper pipes there, which were more than ten times larger than the general steam supply pipes. The weak light came from under the pipes.

"Shouldn't the steam pipelines and electric power pipelines supplying the city of Brino be buried in a shallower layer?" Cassia's heart skipped a beat, and he had some vague suspicion, so he walked over quickly.

There were far more pipes than the few he saw in front of him. Behind these thick pipes, there were more densely packed pipes extending into the darkness. There were about dozens of them, and under the light of the flashlight, they all had different numbers on them.

Looking down, Cassia finally saw the source of the faint light that she had captured when she pushed away the building block not long ago.

Because he heard what Lina said in the morning, what he vaguely guessed at this moment was correct. The ground under the Black Fort has long been hollowed out, which is very simple for the Imperial Mineral Source Company. Then they built it into a smuggling trading center.