 Groves did not relish the prospect of explaining the loss of a billion dollars worth of plutonium to a Senate committee, so a cylindrical containment vessel codenamed "Jumbo" was constructed to recover the active material in the event of a failure.Measuring long and wide, it was fabricated at great expense from of iron and steel by Babcock & Wilcox in Barberton, Ohio.Brought in a special railroad car to a siding in Pope, New Mexico, it was transported the last to the test site on a trailer pulled by two tractors.