Kailua Bay is a vision of blue with regular sightings of a myriad of animals from spinner dolphins to humpback whales to the bright yellow tang. The bay has been a dumping ground for years, said Sarah Milisen, Hawai’i Island Chapter leader for Ocean Defenders Alliance, a nonprofit dedicated to cleaning and protecting marine ecosystems. The ocean floor is littered with nets, old car parts, barrels, derelict fishing gear, glass and plastic bottles and trash in general.