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MIT built a robot the size of a stick of gum that swims using living muscle.

A half-millimeter gel film with light-controlled muscle fins — the first thin, flat robot to get around on living tissue.

ZN ZilverNet EditorialPublished · 3 min read · 4 sources Announced Sep 29, 2026
MIT logo above a labelled schematic of the robot swimming through a maze in a petri dish: a gel body about half a millimetre thick, two muscle-cell fins that contract under light, flashes of light that flap the fins, about four body lengths per minute
Illustration: ZilverNet, with the MIT logo (public domain, Wikimedia Commons). A schematic of how the robot works — not a photo, not to scale; the fin shape is simplified.
The short versionResearch
What it is
A gel framework with two fins coated in genetically modified muscle cells that contract when light hits them.
The result
It swims at up to about four body lengths per minute.
Why it matters
The paper reports that thin muscle films make biohybrid robots more efficient — a step for a field that builds machines from living tissue.
How far along
ResearchPrototypePilotShippingEverywhere
Research. A lab prototype; practical uses are some way off.

What they built

MIT engineers built a robot from a gel called GelMA, roughly the size of a stick of gum and about half a millimeter thick. Its two fins are coated with muscle cells genetically modified to respond to light, so researchers can make them contract — and the robot swim — by shining light on them.

It reaches about four body lengths per minute. MIT describes it as the first thin, two-dimensional robot to move from place to place using living muscle tissue.

"It takes a lot of force to move through water versus air." — Ritu Raman, MIT

Why thin matters

The paper's title makes the point: "2D Skeletal Muscle Thin Film Actuators Enhance Efficiency of Biohybrid Robots."

Uses such as machines that heal themselves have been suggested, but they are forward-looking ideas, not results. The research was partly funded by the US Office of Naval Research.

Sources

  1. Powered by muscle cells, a paper-thin robot swims through watery maze — MIT News · Sep 29, 2026
  2. MIT scientists build a tiny robot that swims using living muscle cells — ScienceDaily, republishing MIT · Oct 23, 2026
  3. 2D Skeletal Muscle Thin Film Actuators Enhance Efficiency of Biohybrid Robots — Advanced Functional Materials, 2026 — Bawa, … Raman
  4. MIT logo and wordmark (2023) — Wikimedia Commons · public domain
Update log
  • Published.
  • New illustration with the MIT logo: the robot in a maze, with what each part does.