Seismic Sensor

A raid alarm that listens to the ground: it fires when explosives go off in range, with a different signal for each type. Pair it with your phone.

Table of contents

Characteristics

Category: Electrical

Stack size: 10

Workbench: Level 2

Craftable: Yes

Researchable: Yes · 30 Scrap

Health: 200

Overview

In-game description

A small device that detects vibrations within a set range. Will output a different power value depending on the explosive type detected, ideal to know when your time has come.

Its own text sums up the job with gallows humour: it tells you when your time has come. It picks up vibrations within the range you set and sends on a different amount of power depending on what blew up, so C4 on your wall and a rocket into your roof do not look the same at the output.

Put it near the middle of your base, where the raid has to go, and set the range so it covers the outer walls without listening to half the map. Then give it somewhere to send the news. Most groups wire it into a smart alarm, which pushes a notification to the phone, and that is how a raid at four in the morning gets a team out of bed. Some add a siren in the main room for whoever is already online.

Thirty scrap to learn, and each one takes three high quality metal plus one piece of tech trash. A second sensor on the far side of a big base costs little next to what it protects.

Raid cost

Explosive	Quantity	Sulfur
Satchel Charge cheapest	1	480
Beancan Grenade	4	480
Explosive 5.56 Rifle Ammo	20–23	500–600
High Velocity Rocket	5	1,000
Rocket	1	1,400
Timed Explosive Charge	1	2,200
Other ways: siege weapons, vehicles and loot
Torpedo	10	120
Propane Explosive Bomb	1	900
Survey Charge	15	900
Mortar Shell	3	1,200
Homing Missile	17	1,800
MLRS Rocket	1	—
40mm HE Grenade	4	—
Hammerhead Bolt	8	—

Direct hit, hard side, no duds. Satchel Charge is a dud 20% of the time. Beancan Grenade is a dud 15% of the time. A range runs from point blank to the far end of the bullet's falloff, fired from an Assault Rifle.