You can learn how to get to Deepholm from Orgrimmar in 2020.

Deep home is a continent situated far below the Skywall.The surface is rough and has fissures and craters.When the realm of fire beneath breaks through, massive volcanoes form, until Therazane's earth elementals can stop the incursion.[4]

There are caves, tunnels and endless passageways in Deepholm.There are many subterranean creatures.It is possible to find gems and jewels that are not known to Azeroth.There is no mining allowed in her realm.Some people think that a few of the precious stones have strong innate magical powers, but the truth may never be proven.[4]

There are hardy plants and animals that live on the surface of this land.Therazane the Stonemother nurtures them when she can because life for them is short and vicious.She considers those she considers her children to be the most important people in her life.[4]

The surface of Deepholm resembles a rocky section of Azeroth.The ground shakes and trembles with frightening regularity, but visitors to the Elemental Plane can find some rest here.Travelers face earthquakes, cave-ins, rockslides and other dangers underground.[4]

The only way to get to Deepholm is to complete the introductory quests.