SM UB-109 slipped through the Dover Barrage once, sank ships in the Atlantic, then returned to find the door had become a trap. This wreck dive follows a German U-boat blown apart by shore-controlled mines off Folkestone in 1918, with eight survivors and twenty-eight dead.

SM UB-55 left Zeebrugge in April 1918 and tried to force the Dover Barrage, but the minefield had other ideas. This SM UB-55 wreck dive follows a successful German U-boat blown open near Dover, with six survivors, thirty dead and a wartime wreck investigation that recovered her gun.

SM UB-33 tried to slip through the Dover Barrage in April 1918, but the Varne Bank minefield had other plans. This wreck dive follows a German UB II submarine lost with all 28 crew, later entered by Royal Navy divers who recovered secret code books from the dead boat.

SM UB-78 tried to force the Dover Strait in April 1918 and found the Barrage waiting. This wreck dive explores a German Type UB III submarine split by mines off Folkestone, with all 35 crew lost and a seabed identity muddle that took divers years to untangle.

SM UB-109 slipped through the Dover Barrage once, sank ships in the Atlantic, then returned to find the door had become a trap. This wreck dive follows a German U-boat blown apart by shore-controlled mines off Folkestone in 1918, with eight survivors and twenty-eight dead.

SM UC-77 spent the war laying mines and sinking ships, then vanished during her own attempt to slip through the Dover Barrage in July 1918. This SM UC-77 wreck dive follows a German minelaying U-boat, 30 lost crew and a disputed final position that still keeps wreck researchers arguing like tired men in a harbour pub.