argonaut

noun3

1. •
   An adventurer on a dangerous but rewarding quest.
2. •
   (historical) A 49er, a person who took part in the California Gold Rush of 1849.
3. •
   Any of several species of shelled octopods of the family Argonautidae (of which only the genus Argonauta is not extinct).

   • Amazingly, it wasn’t until 2010 that scientists experimentally understood how argonauts use their shell constructions to float in the water column and control buoyancy. — 2018