At the time of her construction, Triton was the largest submarine ever built.

As the largest submarine ever built, her performance will be carefully followed by naval designers and planners the world over.

This characteristic earned her the nickname of "the largest submarine in the Navy".

Three hundred miles away, another, much larger submarine was watching the approaches to Bombay.

This class was the largest submarine ever built in the US.

A large submarine is shown "three weeks ahead of schedule", according to the voiceover.

We need a large, fast nuclear submarine, which could neither be detected nor caught.

The large submarine turned slowly from east to north and began its pursuit of the newest sonar contact.

Under the sea, Germany led the way with ever larger and more powerful submarines.

Here he was, underwater, three hundred miles from shore in the world's largest submarine, with only ten men aboard who knew how to run her.