The second glaring item of the many problems that the operator has faced was the failure of the newly designed remote control guns that Schlumberger insisted would successfully perforate the casing.

FORBES: Shortsellers Party Hearty After Their Cheerleader Says McMoRan Is Worth Zero

Motohiro Takamisawa, of the highway's operator, Nexco, said he believed structural failure was to blame.

BBC: Japan Sasago tunnel: Collapse traps cars