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John Jr visits the USS Michigan (SSGN-727)
John Jr visits the USS Michigan (SSGN-727)
8 pages
Author: John Smith
SUBMARINE
ADVENTURE
UNDERWATER
HISTORY
IMAGINATION
Summary
Submarines can dive thousands of feet deep Submarines can stay underwater for months Submarines use ballast tanks to sink and rise Submarines use propellers to move through the water Submarines use sonar to navigate underwater Submarines have a periscope to see what's happening above the water The first functional submarine was built in 1620 by Cornelius Drebbel
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