 Over the flanks of the first two bastions two groups of walls, 33 metres high, join in with a sharp angle facing the sea, forming a group with 7 metres high and extending for 60 meters.It is an architectural project by the sergeant major and engineer Sebastião de Souza.At the ground level of the fortress, there's a chapel dedicated to Our Lady of the Immaculate Conception, today known as "Capela de Nossa Senhora da Conceição do Castelo" (Castle's Chapel of Our Lady of Conception), it was known as Royal Chapel ("Capela Real") and was built in 1733.