Quantum Tunnel

The Quantum Tunnel is a inter-dimensional gateway created by Hank Pym, Elihas Starr and Bill Foster that is capable of creating a portal to the Quantum Realm.

Creation
S.H.I.E.L.D. scientists Elihas Starr, Hank Pym and Bill Foster worked together on harnessing the powers of the Quantum Realm, an alternate dimension that Pym discovered. However, Elihas attempted to steal Pym's plans, resulting in Pym firing and discrediting Eliahs, forcing him and his family to go into hiding. Sometime later, Elihas managed to recreate a Quantum Tunnel, planning to regain his reputation. However, the new Tunnel malfunctioned, causing an explosion that killed Elihas and his wife Catherine Starr, also granting his daughter Ava powers.

After Hank Pym left S.H.I.E.L.D., the Quantum Tunnel never saw completion and the project was shut down, with Foster instead dedicating his life to helping Ava with her new powers.

Recreated
During 2018, Hank Pym was inspired to recreate the Quantum Tunnel, in order to venture into the Quantum Realm to save his lost wife Janet van Dyne.