Air supply hose and sonar: what they have in common

1. Step 1. Air supply hose — is part of — Diving bell. It replenishes the air (Halley).
2. Step 2. Diving bell — uses — Archimedes’ principle. Sinking with ballast.
3. Step 3. Archimedes’ principle — is used in — Ballast tank. Changing buoyancy.
4. Step 4. Ballast tank — is part of — Submarine. Ballast tanks.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.

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