The image is a photograph of a blue sign with Japanese text and images on it. The sign is located in a workshop or industrial setting with various tools and equipment visible in the background. The text on the sign is written in both English and Japanese, and it appears to be explaining the different types of machinery and equipment used in the workshop.

On the left side of the sign, there is an illustration of a submarine, and on the right side, there are two smaller illustrations of a ship. The submarine is shown in blue and white, and the illustrations are in black and white. The illustrations are detailed and show the various components of the submarine, such as the engine, propellers, and other mechanical components. The background of the image is blurred, but it seems to be a part of a larger machine or equipment.