A chair was sunk in order for mussels to grow on it. A chair was sunk in the Oosterschelde in order for mussels to grow on it. This is the chair after having been removed from the water after 2 years of submersion. A chair was sunk in the Oosterschelde in order for mussels to grow on it. This is the chair after having been removed from the water after 2 years of submersion.