852 A Glorious Era

When the various countries learned of the existence of weapon equipment like submarines, they began their corresponding experiments: This was far easier to understand than the arcane-like wireless radio waves; at least by pondering over it, they could grasp a part of the principle.

The "smart people" in these countries actually were quite numerous. Previously, they hadn't conceived of something like a submarine due to the limitations of their thinking. Now that Tang Country had brought forth a submarine, they broadened their own horizons, naturally guessing the gist of it.

Metal cannot float on the surface of the sea, and the reason why ironclad warships were able to float was that there was air inside the ship's hull. Simply expel some air, and the steel could sink into the water; the principle wasn't complex.

Thus, these countries all constructed their own submarine prototypes to verify the feasibility of submersion: Through repeated experiments, they all achieved success.