A retro industrial-style decorative ornament that replicates the shape of an old-fashioned navy diving helmet. It is based on the classic Mark V-shaped diving helmet and restores the helmet's circular window, grille vents, bolt-fastening structure and other details. The overall shape of the ornaments is three-dimensional and full, with rich details. The overall state of preservation is good, with no obvious damage, paint peeling or cracking, and the details are clear.