There are a few things that makes me think. Passengers in the CRJ, were not told that they were doing a belly landing. My initial question. Shouldn´t the crew prepar passengers for it?. Embrace, and take off glasses and that stuff.
Or no told as the passengers told. Was the pilot aware that the landing gear was still retracted?. Shouldn´t there be warnings in the cockpit?. Iberia Regional is pretty safe with hundreds of flights per week with no incidences, but this makes one think.
My mother had a very bad experience last winter as she was flying home from Seville. At night at poor weather conditions, low clouds, no visibility, the lights were off. The CRJ suffered a total loss of power. She told that there was no light anywhere, all dark. In the middle of the clouds. The pilot went up again, and circle, to consume the fuel left over the sea. Then they went down, with strong turbulences, and no sight of lights down on earth.
It was a funny feeling, like staying into a dark washing machine. It seems the tower had to instruct the pilot about how to land. The crew calmed the passengers, but there was a strange feeling in the 35 passengers on board.