Concerned locals have made an emotional plea to An Bord Pleanala to reject plans for a monster sewage plant off the north Dublin coast.
The Dublin sea users presented a powerful video to the planning authority at last week's oral hearing, outlining concerns such as the environmental impact and negative effect on local business of the "shortsighted, reckless and irresponsible" plan.
Locals also cited uncertainty over Brexit as a concern.
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Sean Doran of Howth Tourism said: "We don't know what's going to happen with Brexit. If we lose the east part of the Irish Sea we're going to have to rely more on this part of the Irish Sea to catch our prawns and our fish."
The video adds that have a sewage plant in the area would be bad for tourism.
It said: "Aside from any actual impact on the marine ecosystem, the negative perception of treated sewage water emptying into the waters here stands to have a devastating effect on the local economy."
Local business owners also highlighted concerns over potential malfunctions at the massive plant being proposed by Irish Water.
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Ralph Brady of Feelgood Activities and Scuba Diving said: "If it all goes pear-shaped, what happens? Where does the sewage go?
"Obviously it's going to end up in Claremount Beach, the back of Ireland's Eye, Baldoyle Estuary and Portmarnock Beach - which is a wonderful Blue Flag beach."
An Bord Pleanala are expected to deliver its decision on the plant - which will be four times the size of Croke Park - by June 28.
Howth boatman worried about impact on wildlife if proposed Clonshaugh sewage plant gets green light
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