Astrid, Raiden and the Twins.

Raiden came across an extremely old wall which was starting to crumble, it seemed as there was something behind it as part of a metal wire was reveled although it was extremely rusted, it was clear, whatever was behind there had been here for centeries. He decided to bring the old wall down to see what was there by using his telekinesis to carefully move the rocks to the side. He found a old wooden drop down box which led underground, although, how far, it was impossible to tell. It was extremely rusted, with that he created a telepathic link between him and the other search teams as he let everyone know what he had found. In less than a minute Astrid reported back that she had finished her search and found nothing and she was on her way to Raiden's location. Once there they both decided to investigate what was down the drop down box but after Astrid took one look at how deep it was she realized it would take forever to get down there in the drop down box, and with it being so old and rusted there was no guarantee it would even make it down to the bottom without breaking. So instead she smashed the down down box making room to jump down the hole. The two then jumped into the hole knowing no matter how deep it was, they would be fine. The twins were exploring the north side of the cave with Blade, Tuffnut used his earth manipulation to move the rock in the ground to bring up pieces of iron and other metallic materials while Ruffnut used her weather manipulation to shoot a large electric current through the metal causing it to glow. She kept the current moving through the metal as it lit their path as they began to make their way with Blade, 

Dagur

Once Dagur and his army reached the location where Berserker island used to be, it became clear fairly quickly that the island disappeared but it was pretty obvious that it hadn't sunk due to the lack of rubble in the water. Dagur then turned back to his army and said with a smile on his face,

"Looks like we are moving to Berk boys. I would say pack up your bags and get your family ready but your homes are gone."

As he said this he laughed evilly and then set sail back to Berk.