| 1 | The ship sank deep into the sea. | |
| 2 | These creatures live in the depth of the Pacific Ocean. | |
| 3 | The ship keeled over in the storm and sank to the bottom of the sea. | |
| 4 | They are building a submarine cable tunnel. | |
| 5 | Sea urchins brandish their spines on the seafloor near the Channel Islands. |
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