Underground chamber east of the Odeion ... AMS northeast 953 Horizontal (normal) ... August 1967
Underground chamber east of the Odeion ... AMS west 947 Horizontal (normal) ... August 1967
Underground chamber east of the Odeion ... AMS southwest 950 Horizontal (normal) ... August 1967
Underground chamber east of the Odeion ... AMS northeast 949 Horizontal (normal) ... August 1967