Top photographers and experts reveal their most incredible underwater encounters and explain how you can experience them for yourself.
Peter Cairns can think of nothing better than photographing seabird colonies on the Scottish coast - and he's certainly not alone.
Sea kayaking is a great way to enjoy eye-to-eye encounters with marine wildlife – even for novices.
Some of the world’s best whale-watching can be found in a small group of islands in the mid-Atlantic. James Fair visits the Azores to learn how to tell one sperm whale from another and how to spot sei whales’ footprints.
With some of the world’s finest and most accessible coral reefs, the Cayman Islands offer spectacular encounters with wildlife that are undimmed by the damage caused by Hurricane Ivan in 2004.
Alaska, the big country, has huge appeal for nature-lovers with its magnificent wildlife and vast landscapes.