The Prelude FLNG hull and topsides have been under construction at the Samsung Heavy Industries shipyard in Geoje, South Korea - which has one of the few dry docks in the world big enough to build a facility of this size.

The vessel, a project with joint partners Inpex of Japan, Korean player Kogas and Taiwan's CPC, is destined for gas fields off Australia's northwest coast previously thought too challenging.

Piece by piece, 14 gas plant modules have been built on a quayside at Geoje, then carefully lifted onto the giant hull.

The last module is ready for installation, and the video highlights how Prelude is "taking shape".

Prelude FLNG project director Didrik Reymert, from Norway, said in the video: "Getting off module - that's the real accomplishment by everybody. From now on, progress won't be that visible, but on the other hand, but on the other hand there is a lot of work to do".

FLNG construction manager Huw Jones said: "There are 3000 piping connections to make, 450km of cabling to put [in place], so now the forest of yellow steel is going to get connected together so it's one piece".

Standing inside the LNG cargo trunk, storage tank head Jean Chaplain said it was 39,000 cubic metres.

"It's difficult to imagine," he added.

Pipe engineering lead James Nafraicheur spoke from inside the liquefaction module, "the very heart of the liquefaction process, with this refrigerant loop being assembled now.

"For topsides only, we get 60,000 pairs of flanges to make. Every one has to be done right," he added.

Australian Cris Moreno, project engineering lead, stood at the front of Dry Dock 1 where Prelude's seven marine loading arms had been for the last few months.

"They're all assembled, ready to be lifted, ready for FLNG. So hopefully we'll get to see that in the next few days," he said.

Nafraicheur added that "when we see the last module coming on the deck, now the real work will start".

Reymert said: "If you're climbing Mount Everest, I think we're well past base camp, but there's still quite a long way to go; and of course as we go it gets narrower and narrower".

"I'll give another analogy - it's like Wales winning the Rugby World Cup: we're just getting ready for the semi-final," Jones said.

Final investment decision on Prelude was taken on May 20 2011. Engineers worked more than 1.6 million hours during the engineering and design phase of the Prelude FLNG project.