X. THE MYSTERIES OF SUBMARINE HUNTING EXPLAINED 126

XI. THE MYSTERIES OF GERMAN MINE-LAYING EXPLAINED 143

XII. THE MYSTERIES OF MINESWEEPING EXPLAINED 157

XIII. THE MINE BARRAGE 179

XIV. OFF TO THE ZONES OF WAR 187

XV. A MEMORABLE CHRISTMAS 192

XVI. THE DERELICT 202

XVII. MINED-IN 209

XVIII. THE CASUALTY 220

XIX. HOW H.M. TRAWLER NO. 6 LOST HER REFIT 226

XX. THE RAIDER 233

XXI. THE S.O.S. 238

XXII. IN THE SHADOW OF A BIG SEA FIGHT 248

XXIII. A NIGHT ATTACK 258

XXIV. MYSTERIES OF THE GREAT SEA WASTES 264

XXV. FROM OUT THE CLOUDS AND THE UNDER-SEAS 273

XXVI. ON THE SEA FLANK OF THE ALLIED ARMIES 286

INDEX 301

List of Illustrations

SURRENDER OF THE GERMAN SUBMARINE FLEET _Frontispiece_

FACING
PAGE
PLAN OF A 55 FEET COASTAL MOTOR BOAT 16

LARGE HEAVILY ARMED GERMAN SUBMARINE 32

MOTOR LAUNCH HULLS BEING CONSTRUCTED 56

A 40 FEET COASTAL MOTOR BOAT AT FULL SPEED 64

ANOTHER VIEW OF THE SAME BOAT AT FULL SPEED 64

DROPPING DEPTH CHARGES 80

INNOCENT-LOOKING BUT DEADLY 96

HIDDEN TORPEDO TUBES OF H.M.S. _HYDERABAD_ 96

AFTER-DECK OF THE _HYDERABAD_ (BEFORE ACTION) 104

AFTER-DECK OF THE _HYDERABAD_ (PREPARED FOR ACTION) 104

MOCK WHEEL AND COMPASS PEDESTAL OF THE _HYDERABAD_ 112

MOCK WHEEL AND COMPASS PEDESTAL OF THE _HYDERABAD_ (COLLAPSED) 112

MOTOR LAUNCH CLEARED FOR ACTION 120

A WRECKED COAS