Silicon Valley transit officials are moving forward with plans to dig a single tunnel and close their BART extension funding woes. The strategy is steeped with risk.

After a fallout with the main contractor and scathing rebukes from BART officials, the VTA board of directors voted 8-1-3 to lock in on a new set of design, construction and delivery choices to help close a $700 million funding gap and trigger the full release of federal dollars promised for the extension. Board member and Santa Clara Councilmember Suds Jain — who expressed a lack of confidence in the plan — voted no. Santa Clara County Supervisor Sylvia Arenas voiced similar criticisms, but left the meeting alongside Mayor Matt Mahan before the vote. San Jose City Councilmember Rosemary Kamei was absent.

“While this doesn’t

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