Guests have been warned not to skinny-dip or take selfies with the fish.

Boaties had an incredibly close encounter with orca at Ponui Island near Waiheke. Credit: Jitske Braaksma

A pod of dolphins played with holiday goers in the Bay of Plenty in the second sighting in two days. Credit: Ella Southward

Microplastic particles polluting Earth's oceans now found in Antarctica's pristine waters.

People in Auckland continued to swim at Milford Beach despite a health warning being put in place after raw sewage contaminated the water.

The last time summer was running this hot, Nazis ran Germany. What's been the difference?

Plastics in the oceans are killing corals by increasing their risk of becoming diseased.

Passengers on board Auckland Whale & Dolphin Safari were in for a rare natural show on Tuesday when they discovered a whale carcass complete with feeding sharks floating north-east of Waiheke Island. / Footage supplied by AWADS.

How are oceans faring with pollution, fishing and climate change? Simon Thrush explains.

Record "marine heatwave" could fuel a low-pressure system forecast to hit NZ next week.

They're called dead zones - patches of water that kill life - and NZ isn't immune to them.

University of Auckland researchers Rosalyn Putland and Associate Professor Craig Radford from the Institute of Marine Science combined sound recordings over a nine month period with automatic ship tracking data to track underwater noise contributed by shipping.

The Kerkhof family were out fishing when they came across a pod of about 20 bottlenoses.

International scientific research ship JOIDES Resolution tackles Zealandia missions.

What will happen to NZ's oceans in the future? A cutting-edge model will soon tell us.

Takapuna Beach is closed after sewage flowed into the swimming area between the flags. Credit: Dean Purcell

Understanding prehistoric global warming events could tell us much about Earth's future.

It is awful. People just don't care, it's everywhere, it's everywhere.

Scientists exploring the Kermadec Trench believe they have retrieved the deepest ever sediment sample from the bottom of the ocean using a wire-deployed corer. The sample was obtained a week ago at 9994m deep in a mission that took six hours to complete. / Supplied by NIWA

The orca put on a dazzling display in Akaroa Harbour today. Video/Onuku Farm Hostel Dolphin Swimming

COMMENT: Degradable composites and recycling could lessen pollution.

The oceans cover 70 per cent of the surface of our planet yet they are the least explored.

Scientists have now captured the Worldwide Hum deep in the ocean for the first time.

Continent of Zealandia was always there. Why did it take a century to prove it?

Protection for the pristine Ross Sea is a dream realised for Kiwi film-maker Peter Young.

A pupil's question spurred teacher Libby Bowles to action over the plastics in our oceans.

Relatives angry news of blast revealed a week after sub disappeared.

A heartbreaking scene in Blue Planet is prompting viewers to ditch plastic bags.

Philip van der Mespel, who was picked up by commercial vessel the Norfolk Guardian, describes to the Herald the emergency that led to the sinking of his yacht, and his subsequent stranding at sea.

Pollution-poisoned crustaceans found in Mariana Trench, the deepest place on earth.