Huge Batman Batcave, Flash base/Star Labs, Superman Fortress of Solitude and Gotham City 5.4. While the Tongva Hills cave is a prime example of a hidden cave location, GTA 5's underground world offers more than just this single spot. Keep your eyes peeled for these additional subterranean secrets: Sewer Systems: The expansive Los Santos sewer system is a labyrinthine network filled with hidden passages and potential escape routes.
The Coastal Cave is a mythical location and a large natural cave that is situated on the eastern coast of San Andreas in Grand Theft Auto V. The cave is the largest of its kind in the entire Grand Theft Auto series, with the entrance large enough to pilot a boat through. The cave is located in an isolated cove a few miles north of Los Santos. The cave is moderately deep and is easy to explore.. All Tunnels and Caves in GTA 5 Map. Including underwater caves. I've left out bridges unless they looked "tunnel-like".