In 1929, the Texas Navy replaced its oldest submarines with four new units, the S-14 class:
The S-14s continued the doctrinal shift away from harbor defense and coastal patrol when the S-9 class was developed in 1922. The twenty-year old S-3s were placed in reserve, with one boat retained by the submarine school for training and the other three for spare parts.
Built by Electric Boat in the United States, the S-14s were the largest submarines yet built for the Texas Navy. They were the first boats built with double-hulls and stern torpedo tubes. They were 274' long, and displaced nearly 1200 tons. Range was a whopping 10,000nm at 10 knots, enabling them to keep up with the fleet if required.
The S-14s were considered to have set the standard for Texas Navy submarine requirements when they were built, and future boats would use roughly the same internal arrangement and design characteristics until the development of more efficient hull forms after WWII.