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Shipwrecks
If a ship sinks to the bottom of the ocean, it shipwrecks.
Ocean explorers filmed the deepest shipwreck for the first time.
The ship is a battleship (战舰) during World War II. The Japanese Navy (海军) sunk it.
It is now on the ocean floor, 6,456 metres (米。美式拼法：meter) deep.
People went down to that depth in a special submarine (潜艇). The submarine can work in deep-sea pressure. The filming happened in two eight-hour dives.
Quiz/测验:
What is an ocean explorer ?
An ocean explorer finds out the ocean’s secrets
An ocean explorer finds out the mountain’s secrets
When was the ship sunk?
During World War II
During World War I
On October 25,1943
What is battleship?
A very large ship with big guns(枪)
A very large ship with with a powerful engine