Meet Dick and Pril, an octogenarian couple that built a sailboat in their Californian backyard and set off to discover the world. With their sailboat safely berthed at the Miri Marina, Phil and Iva travel deep into the rainforest to explore some of the largest cave systems in the world. In the jungle they meet 23-year-old Jessa, a fearless entomologist prepared to risk it all for the love of insects.