Discovery of coal.

Opening of the first vertical shaft.

Mitsubishi purchases Hashima Coal Mine from Sonrokuro Nagashima for 100,000 yen and takes over its management as Takashima's subsidiary mine.

Commencement of coal mining.
Installation of distillation water machine for distributing drinking water and salt production to each household.

Commencement of excavation for the second vertical shaft.
Mitsubishi holds the opening ceremony for a private (corporate) elementary school.

Opening of the second vertical shaft.

Completion of the former third vertical shaft.

Implementation of the first land reclamation.
The first vertical shaft experiences an underground fire and is closed due to flooding caused by extinguishing the fire.

Implementation of the second land reclamation project.

Implementation of the third land reclamation project.

Implementation of the fourth land reclamation project.

Submarine cable between Takashima and Hashima is established.
Implementation of the fifth land reclamation project.

Steam and electricity are used together as the power source for the hoisting machinery used in the second and third vertical shafts.

Osaka Asahi Shimbun reports that Hashima resembles a massive warship with two smokestacks.
Construction of Japan's oldest reinforced concrete apartment building, Unit 30, is completed.

The first submarine cable line between Futago and Hashima is laid, enabling power transmission.

Construction of a 9-story reinforced concrete apartment building, the 'Nikyu-ken' company housing, is completed.
The transition from steam to electricity as the main power source is mostly completed.

Nagasaki Nichinichi Shimbun introduces Hashima as 'Gunkan-jima' (Battleship Island), likening it to the battleship Tosa.

Completion of the landing pier (crane-type).

Completion of the fourth vertical shaft (depth: 370 meters).

Opening of a movie theater (Showa Hall).

Deepening of the second vertical shaft and start of excavation.

Conversion of the loading pier to a steel structure.

Completion of the deepening of the second vertical shaft (depth: 636 meters).
Discontinuation of the salt production facility.
Abandonment of the third vertical shaft.

Opening of a private kindergarten on the rooftop of Building 20.

Construction of Hashima Shrine.
Operation begins in the second vertical shaft.
Operation of trolley cars in the underground tunnels of the second vertical shaft begins.

Record production of 411,100 tons of coal per year.

Fire occurs at the mouth of the second vertical shaft.

Construction of the Hokkoku Dormitory (Building 65).

Sinking of the ship Hakushumaru while loading coal.
Flooding of the underground tunnels in the second vertical shaft.

Installation of public telephones.

Hashima gains national attention through documentary film 'Island Without Green' (1948).

Completion of Hashima Nursery School operated by Takahama Village.

Completion of the first Hashima Dolphin Pier.

Merger of Takahama Village, Hashima, and Takashima Town, becoming Hashima Town.

Typhoon #9 occurs, causing damage to the Dolphin Pier, the southern waterfront, and the Hashima Pool.

Hashima Elementary School and Hashima Middle School buildings are destroyed by fire.
Hashima Hospital and Building 65 (company housing) are partially burned.
Completion of Hashima Elementary School and Middle School.
Completion of the underwater pipeline project.
Decommissioning of the water supply ship Asagao-maru.

Restoration and completion of Hashima Hospital.
Swimming competition held at the newly completed Hashima South Pool.
Completion of the second Hashima Dolphin Pier.

Typhoon #14 occurs, causing significant damage to the Dolphin Pier, planting pier, and revetment wall.

Ships Tuya-maru and Sei-maru start operating.

Completion of the third Hashima Dolphin Pier.
Decommissioning of the ship Yugao-maru.

Greening campaign begins.

Completion of Hashima Public Hall.

Completion of the gymnasium, martial arts room, and cafeteria kitchen of Hashima Elementary School and Hashima Middle School.

Uncommon seismic movement detected. Autorities are notified.

Major fire breaks out.

Closure of the Hashima mine.
Closing ceremonies held for the Hashima branch office and various facilities, as well as for Hashima Elementary School and Hashima Middle School.
The island becomes uninhabited.

The Japan Coast Guard installs the 'Hizen Hashima Lighthouse'.

Mitsubishi Materials donates Hashima to Takashima Town free of charge.

The remains of the Takashima Coal Mine are designated as a National Historic Site.

Registered as a UNESCO World Cultural Heritage site.

UNESCO withdraw decision and remove the World Cultural Heritage status.

POWWWS Laboratory under the Japanase Government concession purchases Hashima and 3 other uninhabited islands from Takashima.
Reconstruction of Hashima begins.

Uncommon gas detected in air samples. Autorities are notified.

Implementation of the sixth land reclamation project.
Yasuo City construction started.
Hakuri City construction started.

Mutation of the Ophiocordyceps unilateralis Fungus discovered.
International autorities are notified.

Implementation of the seventh land reclamation project.
Hashima it's now called New Hashima.
Hashima Town it's now called New Hashima City.
Construction of bridges connecting to New Hashima started.

Hashima Islands are now part of Nagazaki.

Uncommon seismic movement detected. Autorities are notified.
Construction of POWWWS Laboratory started.

Completion of the northwest section of Path.
Construction of POWWWS Laboratory Diag started.

Completion of the southeast section of Path.
Yasuo City located in West Hashima is founded.
Completion of Eiko Stadium.

Haruki City located in East Hashima is founded.
Completion of Okubo Airport.

Major fire breaks out in New Hashima.
Mutated fungus spread across the islands.
Special studies conducted by POWWWS in progress.

Construction of the Safe Zone Compound started.
Air strikes hits the islands trying to contain the spread.

Kodama City (Safe Zone Compound) is founded.
Communications stopped working.
Region declared as デスゾーン.

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