The concept of a chapel at the Czech research station of the Masaryk University in Antarctica represents a simple sacral building under extreme conditions. Besides the primary function of a sacral space, it can also provide a shelter to the scientists at the station or to tourists in case of adverse conditions. The concept connects a sacral symbolism with extreme conditions of the locality. At the centre of the symbolism there are a cross, verticality of the space and a circle with five stars as the main symbol of the chapel patron, Saint John of Nepomuk. Moreover, the oval shape of the chapel reacts to the extreme wind conditions, represents a lighthouse at the seacoast, signalizing both a station and shelter. The whole structure should be modular so that its single pieces could be transported from the Czech Republic to the final destination by sea.