With Pokémon Black & White bringing back the HM of Dive, they have added a new area only accessible through this feature. To the east of Sadanami Town is Undella Bay and in that bay there are four spots in which you can dive. When you dive down, you will find that there are ruins. These ruins have four different entrances, with each one accessing a different part of the ruins.

The purpose of these ruins is to get to the end through four different floors. However, there is a limit to how many steps you can take in the ruins before being cast out so you need to find the path and get through it quickly. In addition to that, there are numerous pillars with transcriptions in a style of cuneiform for you to translate and learn from.

First Floor

The task on the first floor is to get to the pillar with cuneiform in the absolute middle of the area. This is easily done by accessing the ruins through the leftmost entrance in Sanazami Bay. Follow the path through to the middle and interact with the pillar in order to gain access to the next floor. There are numerous items filling out the first floor, many of them are necessary for use with Arceus in order to change its form. The items are as follows.

Picture Name Effect
Draco Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Dragon-type moves.
Dread Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Dark-type moves.
Earth Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Ground-type moves.
Fist Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Fighting-type moves.
Flame Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Fire-type moves.
Icicle Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Ice-type moves.
Insect Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Bug-type moves.
Iron Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Steel-type moves.
Meadow Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Grass-type moves.
Mind Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Psychic-type moves.
Sky Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Flying-type moves.
Splash Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Water-type moves.
Spooky Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Ghost-type moves.
Stone Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Rock-type moves.
Toxic Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Poison-type moves.
Zap Plate An item to be held by a Pokémon. It is a stone tablet that boosts the power of Electric-type moves.

Second Floor

The second floor is smaller than the first allowing you for quicker access to the next area. You'll need to go down to the first junction and go around anti-clockwise until you find the pillar. When you reach the pillar, you need to use the move Flash. Once Flash has been used, the pillar will move and you can progress to the third floor.

Picture Name Effect
Relic Silver A silver coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Band A bracelet that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Gold A gold coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Copper A bronze coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Statue A statue that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.

Third Floor

The third floor is even smaller than the previous ones allowing you for quicker access to the next area. The path is essentially for you to go directly right to gain access to the fourth floor. This is fairly easy as the area is small. When you reach the pillar, you need to use the move Strength on it. This will move the pillar and give you access to the next floor.

Picture Name Effect
Relic Band A bracelet that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Copper A bronze coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Gold A gold coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Silver A silver coin that was used by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Statue A statue that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.
Relic Vase A vase that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.

Fourh Floor

The fourth floor is a single room with no maze. It has numerous pillars on the wall, continuing to tell its story. In the middle of the room is one final item. The only way out from here is to go down to another floor and run out the step count.

Picture Name Effect
Relic Crown A crown that was made by an ancient civilization some 3000 years ago. Enthusiasts will buy them for high prices.