Myr - Water Breather

From my personal project of Myr:

Combining gills and lungs, the Water Breather is a ingenious organic apparatus that allow one to not fear any lack of air to breath when diving.

For more details on them, or the lore of Myr at large ->
https://sites.google.com/view/myr-worldbuilding/myr/alchimie-organique/codex-des-alchimistes