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The quick answer is no. There are no tunnels or caves. What BFV has done in reference to the tunnel system is create mobile spawns.
The NVA on select maps have a certain number of shovels. An engineer capable of using the shovel may pick it up and deploy it anywhere else on the map. Any engineer can do this repeatedly. This mimics having tunnels all over the map. It also helps when all of the flags are captured and you need another spawn point. These shovels are key in gameplay if used wisely.
Shovels are destructable so the Allies need to destroy these. If the NVA holds the flag that the shovel originally spawned at, the shovel will respawn near that flag like any other vehicle. If the engineer dies while carrying the shovel, it will respawn in the same way.