Periscope depth!

Periscope depth.

It has a periscope telescope

Bring the ship up to periscope depth.

You see, this little thing acts as a periscope.

Ja, Herr Kapitän? Bring the ship up to periscope depth.

His engines have stopped. We'll go up to periscope depth.

I reckon we'll just drop an egg right down his periscope.

There will not be time to come up to periscope depth.

And now... now I look in the periscope and it gives me the distance and the speed.

The captain would look through his periscope and sight a target, and then he did arithmetic in his head and said Torpedo los!

I'll give him five minutes to get to emergency depth, three to come up to periscope depth, another two minutes to get us in his sights.