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They also pose a threat to human health through the hydrogen sulphide they release as they decomposes, along with native wildlife like critically endangered sea turtle hatchlings which get trapped in thick mats of beached seaweed.

NRW says it has identified the smell as hydrogen sulphide.

"They are highly vulnerable to corrosion," and to CO2, or hydrogen sulphide, both of which are found in subsea well environments, he said.

"They also maintain their integrity over the long term, because they are not affected by corrosion, or by CO2 or hydrogen sulphide. And they also have a reduced installation time due to the rapid hardening of the alloy," Hmadeh said.

The following week an anti-suffragette counter-protest used a motor horn and noxious hydrogen sulphide gas to try and disrupt the speakers.