At night, a section of the Squad 13 records room was covered in shadow.
Within the shadow space, Sora was examining the personnel change records of Squad 13.
During the day, Sora had learned from Kensei Muguruma that the three Shinigami who were responsible for confiscating Saitō Furōfushi's belongings were no longer in the prison squad.
The record mentioning the 'Voice of Hell' had been tampered with, and it was highly probable that the Shinigami responsible for the confiscation at the time were the culprits.
Kensei had looked into the whereabouts of these three Shinigami and found that all three had been transferred to Squad 13 in the same year.
So, Sora came to Squad 13 to see if he could find any trace of these three individuals.
Sora found the whereabouts of the three Shinigami in the records:
"Kitano Asuka... 18th Seat of Squad 13... Died during a mission stationed in the World of the Living..."
"Sawada Taki... Member of Squad 13... Died during a mission stationed in the World of the Living..."
"Kitayama Yūsei... Member of Squad 13... Died during a mission stationed in the World of the Living..."
"All dead..."
"This happened over a decade ago, before Jūshirō Ukitake even became the captain of Squad 13."
Sora continued to read the record in his hands.
These three Shinigami had been transferred over by the then-Vice-Captain of Squad 13, Miyamoto Tetsuya.
After their transfer from Squad 9 to Squad 13, they received a mission to be stationed in the World of the Living, and not long after, they were attacked by a Grand Hollow and died there.
Sora frowned, sensing that there was something very suspicious about this.
A moment later, Sora found the file of the then-Vice-Captain of Squad 13, Miyamoto Tetsuya.
"Former 3rd Seat of Squad 12, promoted to Vice-Captain upon transfer to Squad 13... Went missing while investigating the Grand Hollow attack on Shinigami in the World of the Living, whereabouts still unknown..."
"Hell's will... Reigai... former 3rd Seat of Squad 12..." Although Sora had no concrete evidence at the moment, from this chain of connections, he had a faint feeling that this Miyamoto Tetsuya was no simple character.
"Squad 12's records room is not easy to check... It's bound to have many measures to guard against outsiders," Sora wondered if he should just ask Kirio Hikifune directly.
The three Shinigami transferred from the prison squad were already dead, and the vice-captain who had transferred them was also missing.
The whereabouts of Saitō Furōfushi's 'Voice of Hell' were now unknown.
Since he couldn't "borrow" the Voice of Hell, Sora felt he might as well just ask Kirio Hikifune.
He had originally wanted to borrow the Voice of Hell for his own use, which was why he hadn't mentioned this information to anyone else.
Now that he couldn't borrow it, if he wanted to learn about that former 3rd Seat of Squad 12, he could just ask Kirio Hikifune directly.
But before that, he wanted to go to Muken to meet Saitō Furōfushi.
Saitō Furōfushi had possessed the 'Voice of Hell' for a long time and should have some knowledge of Hell.
Although the Muken prison was heavily guarded, Sora's shadow space had even passed through the Seireitei's Shakonmaku. Entering the Muken prison would not be difficult.
After returning the record to its original place, Sora left the Squad 13 records room.
...
The Central Great Underground Prison was the largest prison in Soul Society, a place where criminal Shinigami were incarcerated.
The place was heavily fortified, protected by a Reishi barrier that even an ordinary captain-level Shinigami could not destroy in a short amount of time.
However, at this moment, a black shadow passed through the Reishi barrier without a sound.
The shadow space created by Sora's Bankai could be large or small. He shrank the shadow space to a size just enough to conceal himself, a layer of black shadow wrapping around his body like a shadow cloak.
This layer of shadow space covering him could take him through most Reishi barriers, and the one protecting the Central Great Underground Prison was no exception.
After passing through the first layer of protection of the Central Great Underground Prison, Sora merged into the building's shadows, observing the prison's environment.
The entire outer shell of the Central Great Underground Prison was constructed from Sekkiseki.
Due to the Reishi-blocking properties of Sekkiseki, this place could be considered one of the most fortified locations in the Seireitei.
There were quite a few patrolling guards, rotating every four hours.
Sora waited for over half an hour for a guard change. Taking advantage of the shift change, he entered a guard's shadow and followed him into the Central Great Underground Prison.
After entering the prison's interior, the guards returned to the guard lounge to rest.
Sora did not act rashly. He had gathered some information about the great prison from Kensei Muguruma; there were also guards patrolling inside.
He just needed to follow a patrolling guard to find the Muken prison.
"Sasaki, you go on patrol by yourself later. I'm tired and want to take a nap," an older guard said to a young guard in a senior's tone.
The young guard had no objections. After resting for about ten minutes, he got up, left the lounge, and began to patrol the prison.
Sora immediately slipped into the young guard's shadow and left the lounge with him.
The Central Great Underground Prison had a total of eight levels.
The upper levels housed criminals with lighter sentences.
The criminals were held in individual cells, looking much like an ordinary prison. One could even see the prisoners inside through the iron bars.
The prisoners on the first level all wore a collar that restricted their Spiritual Pressure.
All criminals imprisoned here had to wear Spiritual Pressure-restricting restraints.
The further down they went, the more Spiritual Pressure-restricting restraints the prisoners wore, and the worse their condition became.
Long-term restriction of Spiritual Pressure caused great damage to a spiritual body.
The young guard's patrol was perfunctory; he didn't believe anyone could invade this place.
The Central Great Underground Prison was one of the most heavily guarded places in Soul Society. It was absolutely impossible for an outsider to sneak in undetected!
A moment later, Sora followed the young guard to the lowest level of the prison—Muken.
The young guard did not enter Muken. The inmates here were all criminals who had committed heinous crimes. Even guards were not allowed to have contact with these prisoners.
Sora quickly detached from the young guard's shadow and, hugging the edge of the corner, used his shadow space to phase through the wall.
Inside Muken, it was pitch black.
But this did not affect Sora's vision. After gaining the ability to control shadows, he could see the shape of things even in complete darkness.
Muken was like a vast, boundless cavern.
"Judging from the footprint of the 'Central Great Underground Prison,' you can't tell there's such a large space underneath... Soul Society still has many secrets... Muken... is this place related to the real Hell?" Sora wondered.
According to ancient texts, this prison called 'Muken' had no end and had existed long before the 'Central Great Underground Prison' was built.
The Central Great Underground Prison was merely a facility built on top of Muken.
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