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UPFs tend to contain more than five ingredients, which are not usually found in home cooking, such as additives, sweeteners and chemicals to improve the food's texture or appearance.

Nandini Sheth, 20, an international student from Sudan, usually works part-time to support her studies but has recently cut down her hours to focus on her final year at Swansea University.

"They usually attack with drones and heavy artillery on this side. When it rains, they advance by taking advantage of the weather."

Ms Foyer added: "Women need protected in society from male violence - but the male violence that most women experience happens in their homes and workplaces and communities, and it usually is from men they know."

The tunnel is usually off-limits when it is filled and coursing with a massive stream of Colorado River water.