Oar shaft and tunnelling shield: what they have in common

1. Step 1. Oar shaft — is part of — Oar. A long rod.
2. Step 2. Oar — has part — Handle. A beater for hand washing.
3. Step 3. Handle — is part of — Chisel. A wooden or plastic handle.
4. Step 4. Chisel — is used in — Tunnel. Hezekiah’s Tunnel was cut by hand with chisels.
5. Step 5. Tunnel — uses — Tunnelling shield. Shield tunnelling.

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