Across
- 1. When was the first container vessel
- 4. Who designed the German U-Boat (last name)
- 7. Where would passenger submarines or boats have most impact on (countries)
- 8. When was the first boat made
Down
- 2. When were submarines first used
- 3. Where was the first submarine made
- 5. what were submarines first used for
- 6. What do people use to travel across oceans