The first aid flights reached Tonga today with more en route, five days after a devastating volcanic eruption and tsunami.

Communities seeking to tackle the clean-up operation awaited a ship with equipment to scale up supplies of much-needed drinking water.

A Royal New Zealand Air Force C-130 Hercules carrying disaster relief supplies landed at the South Pacific island nation's Fua'amotu International Airport, a defence spokesperson said, after a blanket of volcanic ash was cleared off the runway.

Ash deposited by the Hunga Tonga-Hunga Ha'apai volcano has covered the archipelago and spoiled much of its drinking water.

It erupted with a deafening explosion on Saturday, triggering tsunamis that destroyed villages, resorts and many buildings and knocked out communications for the nation of about 105,000 people.

The tsunamis killed at least three people, authorities said, as accounts also emerged of miraculous escapes.

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They included that of a 57-year-old being hailed as a "real life Aquaman" after recounting how he had to swim for about 27 hours after being swept away.

"I just floated, bashed around by the big waves that kept coming," Lisala Folau, who lived on the small, isolated island of Atata, told Tongan radio station Broadcom Broadcasting.

Rachael Moore, Australia's high commissioner to Tonga, said the loss of property had been "catastrophic", that parts of the shoreline resembled a "moonscape" and that drinking water was "an extremely high priority".

One New Zealand navy ship arrived today and a second, carrying 250,000 litres of water and desalination equipment able to produce 70,000 litres a day, was due tomorrow, its High Commission said.

Speaking to Reuters from the capital Nuku'alofa, journalist Marian Kupu said Tongans were cleaning up all the dust from the volcanic eruption but feared they may run out of drinking water.

"Each home has their own tanks of water supply but most of them are filled with dust so it's not safe," Ms Kupu said.

A satellite image shows the explosive eruption of the Hunga Tonga-Hunga Ha'apai volcano

'A long, long road to recovery'

Telephone links between Tonga and the outside world were reconnected late yesterday, though restoring full internet services is likely to take a month or more, according to the owner of the archipelago's sole subsea communications cable.

Tongans abroad were frantically calling families back home to ensure they were safe.

"It was very relieving to hear from them," said Fatafehi Fakafanua, the speaker of Tonga's legislative assembly, who was in New Zealand when the disaster struck, after making contact with his family.

The government had advised them to drink bottled water and wear masks outside because of the ash.

"There's a fine layer of, a blanket of ash, everywhere and I hear that the public are generally out on the streets trying to clean it up," Mr Fakafanua added. "So there's a real communal effort...It's going to be a long, long, long road to recovery."

Humanitarian aid supplies are seen on board a Royal Australian Air Force aircraft at RAAF Base Amberley in Tonga

In a radio address, Tonga King Tupou VI urged courage and hard work for the rebuilding process.

The United Nations said that about 84,000 people - more than 80% of the population - has been badly affected by the disaster with safe water "the biggest life-saving issue".

The volcano erupted about 65km from the Tongan capital with a blast heard 2,300km away in New Zealand.

Waves reaching up to 15 metres hit the outer Ha'apai island group, destroying all houses on the island of Mango, as well as the west coast of Tonga's main island, Tongatapu, where 56 houses were destroyed or seriously damaged.

An Australian Globemaster C-17A military transporter has also landed, carrying desalination equipment, shelter and kitchens, Australian Defence Minister Peter Dutton said.

"The C-17A flight today was made possible thanks to the tireless efforts of Tongan authorities who have worked to clear a thick layer of volcanic ash from the runway," Mr Dutton said in a statement.

A second Australian aircraft was due to make the flight today.

The delivery of the supplies brought in by both aircraft was contactless to ensure Tonga remains free of the coronavirus.