We'll be at periscope depth with a solution to the supertanker.
We're going to be at periscope depth trying to run the show.
The ship had been at periscope depth for most of the day.
Only then would they close in and check her out at periscope depth.
This was a very dangerous place for Cheyenne to be running at periscope depth.
She only needed to be at periscope depth to transmit messages, not to receive them.
Between 0928 and 0955, she grounded several more times at periscope depth.
We might stay at periscope depth if the conditions are really bad.
They carried on towards the north all the next day, most of the time at periscope depth.
Within five minutes, she was operating at periscope depth.