periscope

Horne quotes contemporaries calling the headquarters “a submarine without a periscope”: a huge blunder when facing the Wehrmacht's speedy, flexible operational plans.

The Normandie crew spotted its periscope poking through the waves and sprang into action.

You can sit at the controls and peer through periscopes in a submarine room removed from attack submarine USS Greenling.

In the pond at Manito Park, a moose waded in small circles, standing neck-deep in the murky water, head poking out like a periscope.

The order will see Thales Glasgow continue a 100-year tradition of making periscopes for Royal Navy submarines.