A BLUE WORLD: Just-released drone video captured a blue whale calf swimming under and around a whale-watcher's boat near San Diego, California, Tuesday. https://abcn.ws/2FLyzTu | ABC World News Tonight with David Muir

This is the moment a CNN crew filmed a blue whale swimming directly under their boat. As part of Rolex's Perpetual Planet initiative, the conservationists on board are on a mission to advocate for ocean protection. cnn.com/calltoearth #CallToEarth #PerpetualPlanet | CNN

Blue whales can be found in all the world's oceans except the Arctic. These graceful giants typically swim at speeds around 5mph (~8kph), but can accelerate to more than 20 mph (~32kph) in short bursts. Blue whales generally undergo lengthy migrations between summer feeding grounds and winter calving grounds, but some evidence suggests that individuals remain in certain areas year-round. Video by Taichi Maruyama | Ocean Conservation Research - OCR