Part 3 From Ground Level to Subterranean   29 Prologue to Part 3 156 30 Middle Wallop 157 31 Germany again 165 32 537 Signals Unit. On probation 167 33 Weather conditions 173 34 The wider context 177 35 Other duties 180 36 On watch with 537 SU 188 37 An unexpected sortie 193 38 Domestic and social 195 39 Local life 203 40 Out and about 205 41 Auenhausen 211 42 Tech site travel 215 43 Personal problems 218 44 Down the hole on fighter control 220 45 Üdem detachment 227 46 Down the hole on surveillance 229 47 Out for the count 235 48 Epilogue 238     Appendices   1 Escape and evasion 241 2 East Berlin 248 3 Aircraft information 254 vi