Elon Musk wants to build a Tesla Terafab. Here's why it will be a 'Herculean' task.

Elon Musk has said building a Terafab is critical to Tesla's future.

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• Elon Musk is about to unveil his most challenging project yet: a giant semiconductor factory.
• The billionaire has said Tesla needs to build a "Terafab" to churn out chips for its robotaxis and Optimus robot.
• One analyst said to never rule Musk out, but that building a Terafab could be harder than sending rockets to Mars.

Self-driving cars, cyborgs, and catching rockets in midair...