According to one of the neighbors in the video, these cracks have emerged after heavy rains fall in recent weeks, have a length of several meters and a high depth. Since the beginning of the enlargement work in 2003, numerous cracks have appeared, both by popular movements against the reservoir and by experts from the University of Zaragoza, among others, it has often been reported that the right side of the reservoir is unstable. To avoid risks, two urbanizations were also evicted. However, the works continue.
One of the conclusions of a report recently prepared by Geobits for the Government of Navarra was: The right slope of the Yesa dam presents some situations of uncertainty and is therefore not entirely safe. It was recommended that the hillside be further studied.
The movement against the reservoir has pointed out that, in addition to the great risks, this infrastructure responds to the model of the great water infrastructures of decades ago and is not suitable for climate change and is also a waste: it started with a budget of EUR 113 million and is now close to 500.