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Pacific Rim Uprising is the sequel to 2013’s smash hit Pacific Rim, in which humanity united to create Jaegers (giant human-operated armoured robot machines, or mechas) to fight Kaiju (giant alien monsters, which rose from the ocean). While the first movie ended with humanity destroying the Breach – an inter-dimensional portal at the bottom of the Pacific Ocean through which the Kaiju were emerging – we find out that all is not well a decade later.

In Uprising, society has started to rebuild, but many city areas still lie in ruins – and this is where Jake (John Boyega), the son of war hero Stacker Pentecost, thrives.

He is joined by familiar characters – Mako (Rinko Kikuchi), scientists Hermann Gottlieb (Burn Gorman) and Newton Geiszler (Charlie Day), and new characters Amara (Cailee Spaeny) and Nate (Scott Eastwood). There are new plot twists and concepts, including new hybrid mecha-bio Jaeger drones and mind control.

While Pacific Rim Uprising is definitely action-packed, there is still more to the movie than just giant robots fighting mega monsters. Characters are in parts more fully developed than in the first movie and there’s humour in the form of one liners.

But what of some of the new technologies and Kaiju shown? How plausible are they from a (forgiving) scientific perspective?

Giant monsters, mechas and the square-cube law

The biggest and heaviest creatures to ever walk on land were dinosaurs – with the largest sauropods like Argentinosaurus 

likely weighing in at more than 50 tonnes (weight estimation is an imperfect science). In the oceans, Blue Whales beat even dinosaurs with maximum weights of potentially up to 200 tonnes.


But nothing has evolved (that we know of) that comes close to the size of the Kaiju in Pacific Rim. We haven’t built agile humanoid-like systems anywhere near as big as a Jaeger yet either – our only mobile machines that large are ponderous mining vehicles and the Space Shuttle’s Mobile Launcher Platform. One of the key reasons? The square-cube law. This law captures how the weight and volume of objects change as you make them bigger.


If an animal is scaled up in all dimensions by a factor of two, its volume (and mass) goes up by a factor of eight (the cube of two). But the cross-sectional area of its muscles and bones (say the muscle in its legs) only goes up by four times.

This is why large land animals (such as an elephant) generally look very different to small animals (such as a rat). So the depictions of both creature and machine in the movie require a departure from the physics of everything that we’ve seen in our 

This same scaling law also applies to artificial constructs, such as the mechanical Jaegers. To be able to fight and move like they do in the movie, they would need to be made out of incredibly strong materials – perhaps some futuristic application of graphene.

Heli dropping a Jaeger?


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Both movies show Jaegers being carried around by futuristic rotorcraft. But what would it take to actually lift one?

First we need to estimate the weight of a Jaeger. We can get a rough estimate by scaling up the 1.8 metre tall

Angela: A close, long-term relationship between BMI (Brain Machine Interface) co-pilots would probably improve performance. There are real-life BMI setups where two monkeys using their combined brain activity to control a robotic arm have better control when their brain activity is more correlated.

It’s also been shown that people’s brain activity becomes synchronised when they coordinate to perform joint actions. So two pilots with a long history of coordinating their actions might have more similar patterns of brain activity, and thus have better control over the Jaeger.

So where are we at with Brain Machine Interfaces today?

Angela: BMI technology is pretty impressive these days, but we have to trade off how much control we’d like with how invasive our recording techniques are.

With arrays of electrodes implanted on the brain, we can decode precise gestures, in near real-time. The average person probably isn’t willing to undergo brain surgery just to control a BMI though.

Non-invasive methods are more difficult to decode, but we can usually detect whether you’re thinking of moving your left or right hand within about three seconds, and translate that into an action.

So it seems, if advances in BMI technology were to continue into the future, a brain-controlled Jaeger may just be possible.

Verdict: A credible control system.

The verdict

While it is hopefully unlikely that giant creatures will emerge from an interdimensional void to battle us, Pacific Rim Uprising previews a range of technologies that are likely to be a big part of humanity’s future.

The concept of humans and machines merging in ever more intimate ways, as in The Drift, is likely as scientists continue to push boundaries by combining artificial and natural intelligence.


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