The world of One Piece is a strange blend of whimsy and war, where seashells sing, snails transmit voices, and governments wield weapons capable of sinking kingdoms. Technology is scattered, unevenly distributed — some islands thrive on futuristic invention, while others survive with little more than sails and swords.
Below are the most notable technological marvels and terrors shaping the seas:
Snails used as living communication devices, wired to mimic human voices and signals. They can be trained, modified, or even weaponized.
Standard Den Den Mushi – Basic long-distance communication.
Black Den Den Mushi – Eavesdropping devices used for surveillance.
Fax Den Den Mushi – Transfers written reports.
Visual Den Den Mushi – Transmits images like a video call.
Golden Den Den Mushi – Rare device used to summon a Buster Call.
The most feared military action of the Marines. With a single order, five Vice Admiral warships unleash annihilation upon a target island.
Summoning: Triggered via Golden Den Den Mushi.
Purpose: Total eradication of enemy strongholds, witnesses, or forbidden knowledge.
Infamy: Used on Ohara, erasing an island of scholars from the map.
A rare mineral that carries the “essence of the sea,” nullifying Devil Fruit powers.
Weapons: Blades and bullets forged with Seastone can pierce fruit users.
Cuffs: Standard Marine equipment to shackle pirates.
Ship Coatings: Seastone plating hides ships from Sea Kings by “masking” their presence.
Rarity: Harvested only from select volcanic regions, kept under strict Marine control.
A super-alloy developed in Drum Kingdom by King Wapol. Lightweight, durable, and versatile — capable of shifting into new shapes.
Uses: Advanced weaponry, mechanical soldiers, and unique war machines.
Notable Feature: Self-restructuring, able to reform after damage.
Seashells found in Skypiea that absorb and release energy. Though unknown to most Blue Seas at this stage, they represent an advanced and versatile technology.
Impact Dial – Absorbs strikes and releases them with force.
Heat, Flame, & Flash Dials – Store and unleash elements.
Tone Dial – Records and plays sound.
Jet Dial – Releases air bursts for propulsion.
At this point in history, they’re still secret projects under Dr. Vegapunk. Cybernetic weapons modeled on Bartholomew Kuma, combining Seastone, lasers, and near-unkillable armor.
Purpose: Mass-produceable “human weapons.”
Status: Prototypes in development; whispers in government halls.
The Marines’ dominance at sea comes not only from numbers, but from technology:
Warships – Massive vessels, some with Seastone-coated hulls.
Cannonry – From standard iron cannons to specialized artillery.
Sea Trains – Linking Water 7 to Enies Lobby, steam-powered trains that run across the sea.
Criminal empires trade in forbidden science:
Artificial Devil Fruits (SMILEs) – Early attempts at recreating Zoan fruits (foreshadowed).
Weapons Brokers – Yonko and Warlords often traffic in cutting-edge arms.
Secret Labs – Hidden across the world, where banned sciences are tested in silence.