Additionally, Reed talks about deciding exactly what the Quantum Realm is for Ant-Man 2, since they were left with pretty much a blank canvas.
Ant-Man and the Wasp will fully explore the Quantum Realm this time around and Peyton Reed says that they needed some of Hank Pym’s technology to properly explore the area instead of the freefall that Scott Lang pulled off in the first film.
As for navigating through the Quantum Realm in Ant-Man 2, Peyton Reed and crew built Hank Pym’s lab and it ended up being one of the largest full scale sets ever constructed for the Marvel Cinematic Universe.
Ant-Man 2 has a lot to explain with further exploration of the Quantum Realm and how it ties everything together in the MCU.