When developers started planning an ambitious 2-million-square-foot “innovation campus” in the South Boston marine industrial park, they quickly ran into a big problem: how to get workers there.

Yes, the Silver Line runs nearby, but it’s getting maxed out during rush hour. Parking in the Seaport is increasingly difficult. And so is driving, as traffic congestion overtakes parts of the waterfront.

So you can’t blame the developers — Millennium Partners and its affiliate Cargo Ventures — for getting creative. They’re pushing ahead with plans to send thousands of commuters soaring over Summer Street in a $100 million gondola route that would link South Station with the industrial park. A second phase is also envisioned to connect with the traditional South Boston neighborhood south of the Reserved Channel.