Landmine casing and internal combustion engine: what they have in common

1. Step 1. Landmine casing — is part of — Landmine. A hull.
2. Step 2. Landmine — is used in — Minesweeper. Against sea mines.
3. Step 3. Minesweeper — has part — Sonar. Searching for mines.
4. Step 4. Sonar — is part of — Submarine. Underwater acoustics.
5. Step 5. Submarine — has part — Diesel engine. Diesel-electric submarines.
6. Step 6. Diesel engine — is a kind of — Internal combustion engine. A diesel is a kind of internal combustion engine.

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