https://www.polygon.com/2018/4/18/17253496/pubg-savage-map-cave-system-release-date

PlayerUnknown’s Battlegrounds newest map, called Savage, is a work-in-progress. According to the team at PUBG Corp., they have a very specific vision that will take months to fully assemble. One piece of that vision is an ambitious underground cave system that players will be able to parachute right into.

Fans of the Planet Earth documentary series will recall the dramatic introduction to the fourth episode of its first season, titled “Caves.” In the opening frames, narrator David Attenborough introduces viewers to base jumping, the act of flinging yourself off a high peak with a parachute strapped to your back. It’s just that in this sequence these base jumpers are flinging themselves down the biggest underground cave shaft in the world.