The 'cavern' keeps sewage out of the sea during heavy rainfall.
BBC Jersey
A smaller, second cavern is due to be built by the end of 2023, while the government is considering whether a number of additional storm-water storage tanks might also be needed.Duncan Berry said during heavy rainfall the extra sewage could not be handled by Bellozanne so without the cavern it would end up in the sea
"If we get high rainfall events, we get high sewage flows which Bellozanne can't treat. Before the cavern was built that would have gone out to sea," said Duncan Berry, head of liquid waste for the Government of Jersey. "There's a lot of new houses being built, so whilst we're building a new sewage treatment works, we now need to look at the network - to expand the network, to increase the capacity - so there will probably be a lot more mini-caverns around the island, but just for foul water.
It undergoes an annual clean, during which a team of up to eight people dressed in full protective gear spend about three weeks spraying its surfaces with fire hoses.
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