[Captain Audio]

He could have had workmen transported in covered trucks and not told who they were working for or where the digging was being done. In the old days money could buy silence a lot easier than now days.
There were a great many people out of work here during the depression era so finding a labor force wouldn't be hard.

Some old mansions up north have been found to have smugglers tunnels left over from colonial times. Some tunnels ran for many miles from the town down to caves on the shoreline.
Similar tunnels were constructed to hide out escaped slaves on the underground railroad.

There is a private subway line under New York City, built by the very wealthy to move about the city, or leave town for vacations, without being mobbed by news reporters, much like the Paparazzi of today.

A friend of the family owned a hillside which had an entrance to a huge tunnel complex built during the Cold War. I'd explored the original caves there before the complex was built.
The owner of the major portion of the caves sealed off the opening on my friends side of the property, leaving only a few yards of cave there. The rest of the cave system was turned into a huge fallout shelter with hospital dormitories and even class rooms. There were accomodations for several thousands of people there.
Last I heard the place had been condemned, but its still sealed and guarded. I suspect that since at most only a small fraction of the local population could take sheleter there that its still operational but only for a select few should it ever be needed.

[orion24]

I keep forgetting what decade the Mountain Hangers we built in, Your right a little Hush Money went a long way back then, Thanks Captain Audio.

Bill

[DennyWilson]

He could have had workmen transported in covered trucks and not told who they were working for or where the digging was being done.

In current continuity,the cave is still a natural formation under the Wayne Mannor Property - Bruce brought in Eastern European works to build the batcave,and were VERY well paid for their skills and discression.

[orion24]

That make's sense to do it that way, Then they can be sent on their way back home and no one would ever know, Thanks for the Info DennyWilson.

Bill

[DennyWilson]

When did a cave entrance/exit replace the barn? I know it predates the TV Series by a few years, but I can't remember when?

I did figure out where the TV Series got the idea for the batpoles - there's a mid 1950's issue where Batman and Robin are aiding the fire department durring fire prevention week and they instal poles from the top of the staircase to the cave. Can't recall the issue.

[orion24]

The exact year or issue I'm not sure of, But it was either the late 50's or early 60's.

Bill

[Captain Audio]

I vaguely remember panels from reprints in which Batman's Batmobile of the 30's or 40's was often shown emerging from a tunnel.
These may have simply been the very common highway tunnels found in any suburban local with mountains, rather than exits from the Batcave.

[orion24]

I remember seeing that also in Reprints, At the time I assumed it was always like that because I never seen the old Batcave diagram in those Reprints back in the 70's.

Bill