The fact that you did not even notice that you were about 13 feet [4 m] below sea level proves that the dikes in the Netherlands are still in good shape!
Fakta bahwa Anda sama sekali tidak menyadari berada sekitar 4 meter di bawah permukaan laut membuktikan bahwa tanggul - tanggul di Negeri Belanda masih dalam kondisi yang bagus!