First U-boat war
1900-18 in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea: Law and food. A memory map, not a present overlay.
Western Approaches, Mid-Atlantic gap (historical), Luzon Strait as a Pacific tonnage geography, ROK yards.
Kursk's Barents as a memory geography.
Maps
Treaty and rearmament
1919-39 in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea: Limits and cheats. A memory map, not a present overlay.
Second U-boat / Pacific
1939-45 in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea: Tonnage wars. A memory map, not a present overlay.
Nuclear / SSBN
1954-91 in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea: Deterrent type. A memory map, not a present overlay.
More operators
After 1991 in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea: ROK KSS; accidents as memory. A memory map, not a present overlay.
Portrayals
John Philip Holland biographies
The usual English doorway into Submarine: An early practical-submarine name in English and US histories.
Reinhard Scheer / early U-boat command biographies
The paired doorway: High Seas Fleet context; U-boat war as a parallel campaign -- see also Holtzendorff's 1917 memo fame.
School survey chapters
Where Submarine (1900s-present (as a war type; ancestors earlier)) is a paragraph or a unit in US/UK/AU/CA -- often thinner than Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea local hours.
Local museums / sites in Atlantic 1914-45
Thicker than the English paragraph. More operators is the usual late pilgrimage caption.
Feature film / television
If Submarine has a visual canon, it probably outruns the monographs. Treat film as memory, not as a log.
Korean comparative essays
A Korean reader may pair Submarine with 1950-53, Inchon, Tsushima, or the ROK force-structure story even when the campaign was elsewhere.
Rituals
1900s / 2000-08-12 dates
The usual ritual poles of Submarine: Holland boats and Kursk sinks.
Museum and cemetery wreaths
Official and family rites at sites in Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea. Vasili Arkhipov is often the civilian or corrective name on the plaque.
Classroom minutes
Where Submarine is on the syllabus -- in Anglophone schools often beside 11 November or a Second World War unit, not always beside Atlantic 1914-45, Pacific 1941-45, then a nuclear-deterrent undersea's own calendar.
Sayings
Liverpool and Chicago's U-505 (museum) are English-language civic sites.
No live transit lanes.