The child took the leftover ice and continued on with the theme of using the pressurized ice grates, except the grates were more tightly condensed. Except for this time, they made the grates span horizontally, wall to wall, that went down and down until the last grate was three metres above the bottom of the ground. The grates were set every metre, and in total, they made and attached 47 and a half grates. The last grate they would complete was when they figured out how high they wanted their water level to be.

The whole reason why the child decided to do this type of grate system is that they had to find and crawl down various-sized small holes.

Opening up a tunnel to the fifth floor, the child watched as they siphoned water down, and it increased centimetre by centimetre. They finally cut off the water at two metres and a half, and they went to finish the last part of the grate.

The half grate only surrounded the edges of the room, and it was two metres wide, had ice grate walls and had 50 centimetres of water filling it. The only exit was right against the ice wall, forcing invaders and adventurers to swim underwater for two metres.

Taking the pouch that the group of Tsiamewo with the three mages that the child held a great dislike for, they opened it and found a small, round, fleshy but hard green plant. The child poked and prodded the strange plant until they realized it was meant to grow in water. Calling it the "chihuan," the child placed it on the water part of the grate.

Along with the chihuan, the child started placing all of their new plants from the original greenhouse room along the grates and all the plants they had from the eighth floor. Just like with the eighth floor, they wanted it to have an overgrown look, so the child placed a mana string to help the growth go wild.

As that was working, the child thought about what they wanted to do for the aquatic part of the floor.

The broken pieces of the ship were the centrepiece, and the child had two ways of going about highlighting the ship. The first is to completely cover the ground with kelp and grass, enough so that the ship is completely hidden, making it more of a mystery. The second way is to create a coral reef like the ship was hit and sunk because of the coral.

As the child thought about it, they realized something. Way back when they were stuck within the five islands, they received a notification that they could create some water mechanisms. Water flows or traps, stuff like that, and while they have created flows, they haven't touched the trap part of it.

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After thinking about it a bit, the child created a small square, from ten by ten centimetres to thirty and thirty centimetres, that activates when an invading non-dungeon being passed over it or by it; it activates and creates a strong pull of water that pulls and sticks them to wherever the square sits. It works up to about a metre away, and the child placed them sporadically across the aquatic portion of the walls.

It was the child's idea that when they swam out of the grates or are in the grates, they would be pulled or stuck enough to either drown or get injured, allowing their plants, animals, or monsters a chance to attack.

Congratulations! You have made your first trap!

Please name your trap.

After considering what they wanted to call the trap, the child settled on the name "water yanking square."

"Water Yanking Square" has now been registered within your dungeon.

As soon as their trap became registered, the few spots they had already made part of it changed. The squares became visibly different, though they still blended into their ice walls. The trap became outlined with a deeper blue colour. Still, it wasn't very obvious with the water and the ice already a blue colour.

With the creation of their new trap, the child decided on the main aquatic environment, a coral reef.

While they were torn between coral and kelp, they thought the coral would be more of an obstacle, especially with the traps; they could even be weapons.

Taking all of their nine types of coral, the child placed them all around the ship. They noticed something happening as the coral grew and reproduced to cover most of the sand.

A small piece of verglass coral attached itself to one of the lower trap squares and started growing on it.

The child watched as the piece of verglass coral grew on the trap, confirming that they could hide the trap square. That they could help hide the trap square from view with the coral.

Looking at the 11 traps they had set across the room, the child tried to cover or obscure them with the coral to make them even harder to find.

With the coral growing, the traps set, and all of the basics of their floor completed, the child continued on with populating their room with plants, creatures, and monsters.

Unlike with their eighth floor, the child made these grate levels plant-specific. Well, the child placed their plants on levels corresponding to what they would be placed if they were creating a forest.

They began by taking their red oak and white birch tree species. While they were able to get the trees to grow through the small, eight-centimetre-wide openings of the grates. But they were able to grow all the way up, even though they did not look like the traditional trees. The trees were thick in between the grates but split up to grow through the grates and then merged back together. The child made sure that their branches stayed around the grates, creating canopies along the top ten levels, areas of branches and trunks in the middle 15 levels, with systems or roots in the bottom 20 levels.

The child continued on with their work until the part of them that observed their surroundings picked something up.

Coming out of one of the more constant storm systems was a fleet of five large ships, all battered from the storm they came from.