The phoenix flew away along the water pipe.

Facing Felix's puzzled eyes, Dumbledore explained: "Fawkes is too weak now. It can't take the three of us. If Harry is in danger, as long as he sincerely seeks help, Fawkes will sense his location."

At this time, a cold voice came from outside the door, "Sorry, I think it's four people." Professor Snape appeared. He was wearing a dark green pajamas, his hair was messy and he was slightly panting.

"Severus," Dumbledore looked at him, "You are here too."

"How could I not come, Potter... The life of a Hogwarts student is threatened!" Snape's temper was not very good, "What are we waiting for? Do you want to have a party here?"

"That's right, Severus." Dumbledore seemed to suddenly realize it. He glanced at the four people present, "Miss Granger..."

"I want to go down!" Hermione said quickly: "I won't hold you back. I can, um..."

She saw the schoolbag in the corner, her eyes lit up, ran over to rummage through it, and finally found a magic scroll.

"Headmaster, professor, this is Harry's scroll. It records some of the pronunciation of Parseltongue. I think it might be useful."

"What is this?" Dumbledore showed a surprised expression, and he looked at Felix.

"We mentioned it..." Felix said implicitly, and the headmaster understood.

"Very good, Granger." Dumbledore praised.

Hermione tried her best not to show complacency.

Dumbledore touched her shoulder with his wand, and she felt herself become light and floated from the ground with a little effort.

Then, the three of them cast a levitation spell on themselves, "Are you ready?" Dumbledore got a positive answer, and he waved his wand, and the four of them flew into the dark water pipe like light soap bubbles.

Next, there was a long underground slide. Felix was not sure whether it was five kilometers or ten kilometers. The tunnel was winding and twisting, and sometimes it would spiral down.

With the help of the magic light, Felix could see that the inner wall of the slide was sticky and wet, and many pipes branched out in all directions.

Finally, the downward slide became horizontal. They came to a circular open space, the ground was filled with stagnant water, and on top of the stagnant water were countless pale rat skeletons.

At this moment, they were standing on a huge pile of bones.

The tunnel was as silent as a grave.

Dumbledore looked around with a serious expression. He had never known this place before. He whispered, "A huge project... It seems that Slytherin spent a lot of time on this."

The four of them walked towards the largest tunnel entrance. In the distance, Felix saw a coiled behemoth.

"Close your eyes!" He shouted quickly.

Hermione closed her eyes obediently, and Dumbledore and Snape closed their eyes and drew out their wands.

Following the feeling, Felix swung out a blazing red light, and the spell as thick as his wrist hit the behemoth's body roughly, making a dull roar. At

the same time, there was an extremely hidden sound of wind - this was Snape's spell.

Dumbledore also took action, and he cast a light golden shield for the four people.

After waiting for a while, there was no expected hissing or movement of the basilisk.

Felix opened his eyes, and the huge monster had broken into several pieces, but there was no smell of blood.

He and Snape stepped forward and found that it was a huge snake skin, green, but the surface was stained with a layer of dust, which looked gray-green.

"The basilisk is at least twenty feet long - and," Felix said, "Excellent Cutting Curse, Professor Snape."

Snape retorted, "You are not bad, Felix, your 'Dizzy' effect is comparable to the Explosive Curse."

Hermione and Dumbledore came closer, and Hermione carefully looked at the remains of the snake skin. One third was blown into pieces - this was the trace of Professor Hep's magic, and the rest was cut in half, the cut was smooth and flat, obviously some powerful cutting magic.

The little witch picked up a piece of snake skin, which was hard, like a piece of metal. She couldn't help but smack her lips.

Dumbledore carefully examined the basilisk's shed skin, "It's been a while. It might have been left by the basilisk when the Chamber of Secrets was opened last time."

At this moment, a crisp phoenix cry came from afar.

"We need to speed up." Dumbledore took the lead and walked in front.

They turned one corner after another, stepping on the wet water under their feet, making a clacking sound. Hermione felt sticky under her feet, her nerves trembling uncomfortably, and she just wanted to end it all as soon as possible.

Finally, they encountered a solid wall with a round iron door embedded on it. This arrangement looks a bit like the round door of the Gryffindor common room, but there is no portrait on it, but seven entangled snakes, their eyes are inlaid with large, shining emeralds. The snakes' tails intersected, and the snakes' heads spread out, completely sealing the entrance.

"Obviously, we need an entrance command or forced destruction." Felix said.

Snape waved his wand, and under the effect of the invisible cutting spell, the iron switch burst into a brilliant green fluorescence. When everything returned to calm, the round iron door was intact.

Dumbledore stroked the twisted snake on the iron door with his fingers, and shook his head, "I can break it, but it will take time." He looked at Felix.

Felix took out the scroll with understanding and threw it high. The magic scroll quickly spread out and stretched to a length of seven or eight meters.

He touched his wand on it and whispered, "Open." The handwriting on the magic scroll began to twist, deform, and reassemble, and soon a vortex appeared in the center of the scroll.

The four people present heard a strange, "hissing" sound from the magic scroll.

The next moment, the round iron door moved, and from the intersection of the snake's tail, a smaller snake swam out, it swam around the iron door, and then with a "click", the door opened.

"Professor, what is this?" Hermione was a little curious. She didn't know that the magic scroll had this function.

"It can convert my words into Parseltongue. Of course, the premise is that it has enough Parseltongue information stored inside."

Dumbledore said with admiration: "Is this the point you and I mentioned during the interview, combining Muggle wisdom with magic?"

Snape and Hermione's eyes fell on him at the same time.

Felix said calmly, "It's just one try."

"Felix," Dumbledore said, "there aren't many wizards as open-minded as you."

Then the group continued forward, passing through the round iron door and before them was a long, dimly lit room. The room was shaped like a hammer, and the handle of the hammer was the wide corridor in front of them, with many stone pillars carved with coiled snakes on both sides of the corridor.

These stone pillars rose high to support the high, dark ceiling, casting long, strange shadows in the green light.

At the end of the room was an open space, like the square head of a hammer. At the edge of the space was a statue as tall as the room itself, clinging to the dark wall behind it.

Felix recognized it almost immediately as a statue of Slytherin; he had seen similar things in many books.

His eyes fell on the open space, where a fierce battle was taking place.

A blind basilisk was twisting its body wildly. It was thirty feet long, and every time it swung its body, it would stir up a large rain of stones. A young wizard dodged in a panic.

It was Harry Potter.