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Although this article is based on canonical information, the actual name of this subject is pure conjecture.

Hiccup wore a diving helmet in Race to the Edge, Season 4, in the episode "Dire Straits". He uses it to dive to the sea floor to free the Submaripper by using Changewing acid to melt the chains that bound it. This helmet allowed Hiccup to breathe underwater for an extended period of time. It was developed alongside the Diving Bell.

It's unclear if Hiccup made it himself or if Fishlegs made it, as when we first see it, Fishlegs is handing it to Hiccup shortly before he climbs into the Diving Bell.

Hiccup is seen wearing this helmet briefly when he does an experiment with Fishlegs on mixing Death Song amber with Gronckle Iron in "Living on the Edge".


Like the Diving Bell, the helmet appears to be made of Gronckle Iron and Death Song amber. It also seems to be a modified Berserker helmet. It has traditional Viking horns attached to the top, and a thick leather cowl collar at the neck to keep the water out.



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