Dryfire

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A German Experiment Proved That Simple Concrete Spheres Make Fantastic Batteries. Now, California Plans To Submerge A 9-Meter Diameter Sphere In The Ocean And Is Already Planning Versions Of 30 Meters in c/science@lemmy.world
[–] Dryfire@lemm.ee 15 points 2 days ago (1 children)

There are 2000 year old Roman concrete piers that are still just hanging out in sea water. So it's possible if you find the right mix.