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The "real" submarines were operating in a limited way in WWI, but their use in WWII is well documented. They continue in use today. That makes it about a hundred years. The history of the submarine goes back a ways, but the technology to actually built a "good" one is recent. A link is provided.
What else can I help you with?
Was the helicopter invented before the submarine?
No. The submarine came about long before the helicopter.
How long has this website been up?
since computers were invented
How long has the car been around for?
the car has been around since 1885, it was invented in 1885.
How long has drunk driving been going on?
Since beer and car where invented.
How long was wedding photography been around for?
Since the cameras were first invented
How long have people been using cars?
Since 1885 which is when the first automobile was invented by Benz
How long has electrical engineering been relevant in the US?
Since it was invented in the late 19th century.
How long has Fiji been in the Southern Hemisphere?
Since long before humans invented the cardinal points of the compass and the system of hemispheres.
Who invented the hacksaw?
Like most hand tools, the hacksaw was invented in ancient times, and the name of the inventor has long since been lost to history.
How long have allergies been around?
It is not known exactly how long asthma has been around, but it was first described by the Greek Doctor, Hippocrates. Hippocrates lived from 460-357 BC.
How long have dogs been playing with Frisbees?
well, the frisbee was invented in 1957, so i would figure since then.
What year pancakes were invented?
Pancakes have been made since long before the beginning of any recorded history.
