Submarine blueprint decor. This design features the internal workings of 'Bushnell's Turtle', the world's first submarine. The artwork is created using a combination of 3mm composite wood and a printed background. A raised tag mounted underneath the blueprint features the submarine's name and the year it was built, 1775. The Turtle (also called American Turtle) was the world's first submersible vessel with a documented record of use in combat. It was built by American David Bushnell as a means of attaching explosive charges to moored ships in a harbor. Please note that this artwork does not come with the frame. Artwork Materials: Chlorine free, acid free, sustainably sourced, 300 gsm matt cardstock backing from Fedrigoni in Italy. Sustainably sourced, 1/8" (3mm) thick composite wood. Canon PIXMA ink. Packaging Materials: Sealed clear cellophane bag. 1/32 inch (1mm) thick recycled card protective backing. 3.25 x 4.25 (8.5 x 10.5 cm) product information slip.