Offshore drilling platform and laser: what they have in common

1. Step 1. Offshore drilling platform — uses — Archimedes’ principle. Floating platforms.
2. Step 2. Archimedes’ principle — is used in — Ballast tank. Changing buoyancy.
3. Step 3. Ballast tank — is part of — Submarine. Ballast tanks.
4. Step 4. Submarine — has part — Periscope. A periscope.
5. Step 5. Periscope — has part — Mirror. Mirrors or prisms.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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