. >> reporter: mel boyd today still can't forget a scare that sent him running from the unfinished tube. the noise turned up to be a ship running anchor through the bottom. today boyd says it's the safest part of the project. >> me personally i would feel the safest in the tube than any other part of the project. >> inflation zapped reserves, overruns and improvements put it overbudget by $150 million. that's why there's a half cent tax today in b.a.r.t. served counties. b.a.r.t. cars were also designed to withstand high wind. a strike and other delays at car contractor roar and bulky fare collector machines all helpedded put b.a.r.t. more than a year behind schedule. >>> tens of thousands ride b.a.r.t. through the tunnels every day but how much know what it took to put the tunnels there. we'll have two reports from the day that the tunnel was opened look at them with that u-verse wireless receiver. back in our day, we couldn't just move the tv wherever we wanted. yeah, our birthday entertainment was a mathemagician. because if there's anything that improves magic, it's math. the only t