|Shipyard||Vulcan, Hamburg (Werk 59)|
|Ordered||9 Mar 1915|
|Launched||9 Jan 1916|
|Commissioned||10 Mar 1916|
|Fate||8 Jul 1916 - Lost while laying mines off Kinnaird Head, Scotland. 33 dead (all hands lost).|
The Royal Navy destroyed nine mines laid by U 77 off Kinnaird Head in late July 1916. In 2020, Kevin Heath and Michael Lowrey were able to identify a wreck in the UKHO wreck database in U 77’s minelaying area that like was the Günzel’s boat. The wreck was determined to be a submarine using a dropcam in September 2021 by local divers. More information is available here:
Previously recorded fate
Lost in a minehandling accident off Dunbar, Scotland. The wreck at that location is undoubtedly that of U 74.
There was another U 77 in World War Two
That boat was launched from its shipyard on 23 Nov 1940 and commissioned into the Kriegsmarine on 18 Jan 1941. Take a look at U 77 from WWII.