So I decided to build a facsimile of a U.S. Navy diving helmet, the Mark V. Something like this one (which was auctioned off at Vallejo Gallery):
Dive helmets like the Mk V are widely-recognizable, and appear in pop/pulp fiction, adventure stories, and graphic novels/comics; anywhere there’s a style-heavy industrial motif, like steampunk. The strange rounded rectangles on the front viewport, and the globe-shaped hat are instantly familiar, and serve to set the tone for an other-worldly scene, or vintage setting. Like in this H.P. Lovecraft themed poster by Italian artist Francesco Francavilla