It is also operating a round-the-clock "lock door policy".

BBC: Rox in George Street in Edinburgh

The basic reality of American prisons is not that of the lock and key but that of the lock and clock.

NEWYORKER: The Caging of America

It builds on the standard kidnapping and ransom policy by bringing in consultants to train crews in security, prepare emergency safe rooms where crews can lock themselves in until a hijacked ship can be retaken, and provide round-the-clock advice to captains on safe routes to take.

FORBES