Don't all companies do that? GE will also share basic techniques between departments. And if you don't have another department to get the knowledge you contract

Don't all companies do that? GE will also share basic techniques between departments. And if you don't have another department to get the knowledge you contract other companies. There's no need to invent everything yourself. To me the whole thing sounds more like a marketing stunt. Tunneling is extremely expensive. Musk knows how to make products more efficient but the improvement needed in this case is probably far more than what he achieved with Tesla.