In a quiet, remote slope of Ios Island, far from the sea, we were asked to design a summer house for a couple. The intention was simple: the house to be the ultimate resting and relaxation space, offering contact with the nature of the island while aiming to the unobstructed view of the sea. The design is inspired by the underground architecture, reminiscing a cave. The house is developed on one level of about 100 square meters on a slightly sloping plot of 4 acres. There is only one facade facing west, while the others are covered by the slope. The roof is planted with prickly pears, providing insulation while bonding the building to the surrounding landscape. The facade is lined with local stone, built in such a way that refers directly to the existing stone walls of the plot, integrating in a way with the environment. The interior, in contrast to the exterior style of the building, has been treated with modern design. The kitchen, the dining room, the living room and the bedroom are actually one large space. This feeling is enhanced by the common material that was used both for walls and floors, a forged cement in a soft gray hue. The natural indirect lighting coming from the skylights increases the luminosity of the premises, giving a calm and relaxed atmosphere. The semi-open space right outside the dining room, along with the barbecue under the pergola, are a focal point for the couple and their friends, that want to enjoy the sea view.