Developed by SailGP for their international sailing league, the new foiling machines are the world's fastest and most technologically advanced sail race boats.

Australian skipper Tom Slingsby was one of a few sailors selected to guide Tenet's production team to set up dramatic, boat-on-boat scenes in the Solent, under the watchful eye of Nolan from a helicopter.

SailGP were first approached by the studio to appear in the film during last year's San Francisco event on May 4, when Christopher Nolan and his crew jumped on board an F50 and observed them in action during the race.

From the event, Nolan was so impressed he included them in the movie, appearing in a scene filled with tension and action.

Appearing in the movie are two F50s - the Japan and US boats - which were rebranded exclusively for the movie.

Filming involved 12 days of sailing, and production included multiple helicopters, chase boats, high-tech camera boats and IMAX cameras.

During filming, Slingsby and USA skipper Rome Kirby would get the boats up on the foils well behind the camera boat, and fly by in time to get the right shot, then turn around and do it over and over again.

Kirby went the extra mile, acting as Elizabeth Debicki's stunt double on board during the close-up sailing scenes, complete with blonde wig.

"It was unbelievable how hard the production team worked," Slingsby said.

"We were putting the boats in the water at 4am, and it was rare if we were finished by 10pm. Then we were straight back into it the next day."

"We were there to tell the directors what the F50s could and could not do, when it came to the choreography of the boats.

"They would ask 'how close can we get the boats together', and we would coordinate tacking duels.

"They were happy to take our advice on board."

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The plot was a closely guarded secret, but Nolan worked with the sailors to get the epic shots required for the film.

"Christopher Nolan was great to all the sailors, and it was a pleasure for us to be involved.

"I was able to collaborate with him a little bit in organising the helicopter shots, so that it didn't affect our wind and could still get the best shot."

It wasn't all smooth sailing during the shoot, and Slingsby revealed that the crew took some time to truly comprehend the speeds the F50s were capable of.

"On the first day, they rocked up with a high-tech camera boat, which they were pretty excited about.

"They said it goes pretty fast, it should reach around 14 knots.

'They were shocked when I said the F50s didn't start foiling until at least 17 knots.

"We will be looking to get up to 35 knots when we are sailing."

The futuristic technology of the F50 certainly matched the theme of Tenet, and SailGP organisers hope fans will get a chance to see them live in action next year, with SailGP Season 2 expected to re-start in San Francisco and New York in April and June.

The league wants to hold seven to nine events for Season 2, with racing set to hit Australia and New Zealand in early 2022.

"We are excited to get back sailing next year," Slingsby said.

"We have new events, and new teams.

"During this downtime we have been able to make some upgrades to the boats, and improve the whole package of SailGP."

"I'm excited about the New Zealand team entering the league. Peter Burling and Blair Tuke are old friends of mine, and we have raced against each other many times.

"They are the missing piece of the puzzle, and now we can definitely claim we have the best sailors in the world in our competition."

Hylas Yachts has revealed a new M49 cruiser designed by New Zealander Dean Salthouse.

The M49 was developed as a larger model than the Hylas M44, offering more room in the aft lounge, increased capacity to carry water toys, and enhanced stowage for the dinghy. Its extra length of 15 metres comes from its extended aft cockpit, and has large accommodation space below.

The M49 is powered by twin Yanmar 8LV-370 8-cylinder diesels, and recorded maximum speed of 31 knots during sea trials.

"It is very noticeable how stable the Hylas M49 is in terms of the beam to beam roll," Dean Salthouse said.

"As for athwartship stability, with the longer waterline, the M49 handles the seas."

The world's oceans will experience more intense marine heatwaves than the global average in coming decades, according to researchers from the ARC Centre of Excellence for Climate Extremes at the University of Tasmania and CSIRO

In a paper published in Nature Communications, the researchers said that, in particular, sections of Australia's Leeuwin current and East Australian current would experience intense heatwaves over the next 30 years.

"We know marine heatwaves are on the rise globally, but policymakers, fisheries experts, aquaculture industries and ecologists need to know how this will play out at regional levels, especially in terms of where they will occur and how much hotter they will be," Dr Hakase Hayashida from ARC said.

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