In this video the fractal Solid Ocean is done. This fractal is part of the Fractals of the Mist dungeon which was released with the Lost Shores patch for GW2. The Solid Ocean is a sort of final boss encounter after you have done three consecutive fractals and are ready to go up a difficulty scale. This dungeon does always pop up, but when it does, that is a good thing. The dungeon is fairly easy, gives you another big chest and twenty free fractal relics on top of the normal fractal relics you get from doing fractals!
Enjoy, and good luck in Fractals of the Mist!