Yep, you can tuck your sandy 'giner away now, because the tunnel is only ~1/8 completed. I'm sure in 2020 we'll still be using this thread to rant about the next big unforeseen issue, and none of us want to see your sandy 'giner again 'till then.. An issue which could have likely been avoiding by not trying to tunnel through regrade along a waterfront in earthquake country with unproven drilling methods underneath and alongside century-old buildings in the first place. God forbid if they should run into another pile of shells which might be a 2000 year old indigenous archeological site where we'll have to call in the archeologists to conduct a month long evaluation of that pile of shells with paint brushes.