Season 10 Episodes10
Cast2

Mike Bratton
Narrator
S
Susie Sheehy
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Ranked #4 of 9 in Season 10•+0.1 vs season avg
The deepest-diving submarine is a monumental feat of engineering.

Mike Bratton
Narrator
Susie Sheehy
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"World's Greatest Submarine" is episode 3 of Impossible Engineering season 10. It scored 7.6/10 from 10 votes, ranking #4 of 9 episodes this season (season average 7.5). It aired on June 23, 2021.