Reading this list, one knows that many of the early submarines no longer exist, having been lost in the World Wars or sold for scrap.

Although early submarines were less-than-seaworthy, their progression through present times has been remarkable.

And the early submarines could move with strict, careful calculation of underwater charts.

This design, visible in early submarines (see below) is sometimes called a "teardrop hull".

While among the earliest submarines to successfully make use of electric power, she proved to have a severe flaw.

This was made worse as early submarines also spent almost all of their time surfaced, and had little freeboard to begin with.

The size and regular shape was similar to the hull of an early submarine.

He also developed several models of early submarines for the Russian Navy.

The standard navigation system for early submarines was by eye, with use of a compass.

Her hull embodied several new features later used in early submarines.