Meet Greta Green: pint-size pioneer of the sea!Greta Green adores the ocean and spends her time cleaning the shoreline with her trusty bird and hermit crab. She can only dream of diving below the surface to discover the wonders hidden beneath...until the day that Greta gets a big idea: She and her pals will build their own submarine!And that's exactly what they do. But the underwater world brings both hidden treasures and dangers. What will Greta and her crew discover along their journey? And can they find a way to continue helping with ocean conservation?With cheerful rhyming text and whimsical artwork, this is a story about dreaming big, protecting our oceans, and staying true to your heart. The book includes information on submersibles and submarines, famous shipwrecks, and real-life female pioneers of the sea.