Submarines, other than those used for local sightseeing, have never become a means of mass transportation. They are much more complex to operate and maintain than ordinary ships, and more expensive to construct.
Their use is almost exclusively for military vessels and for deepsea research.
Submarines allowed blockaded 5navies like Germany to wreak havoc on the high seas and even the odds with nations which much larger surface navies.
People could go farther away from home
Matthew Henson has traveled all the way to the North Pole. he was accompanied by Commander Robert E. Peary.
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america
The existence of submarines forced other countries to develop anti-submarine weapons and detection systems.
never change
Vehicles increased the speed that long distances could be traveled.
They were brought there in the same way people traveled there.
Submarines can pump sea water into or out of ballast tanks, if they wish to change their weight (of course, anything that enters or leaves a submarine will also change its weight - people, supplies, weapons, etc. - but if you just want to change the weight, the easiest way is to pump water into the submarine).
This is referred to as a nomadic way of life.
Yes, it was the only way people traveled in those times.
The traveled on mountain roads. Messangers and armies used this way of travel.
People could go farther away from home
They did not in any way.
The sedan chair, steam locomotion and aviation.
what is one way that people can change negatively