How many people have been in a submarine?

Estimating the exact number of people who have been in a submarine is challenging, but it is believed that tens of thousands of individuals have experienced submarine travel since their inception. This includes military personnel, researchers, and tourists who have participated in submersible dives or submarine tours. Notably, the number of civilians who have gone on deep-sea submersibles is much smaller, often limited to scientific missions or adventure tourism. Overall, while precise figures are difficult to ascertain, the number likely ranges in the tens of thousands globally.