Technology of the Seas

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:

Den Den Mushi (Transponder Snails) 🐌📞

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.

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.

Seastone (Kairoseki) ⚔️🌊

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.

Wapometal 🛡️🔧

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.

Dials 💨🔥⚡

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.

Pacifistas (Foreshadowed) 🤖💥

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.

Naval Weaponry ⚓💣

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.

Underworld Technology 🕸️💀

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.