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I hadn't planned on going to this trouble, but as a counterpoise to free_life's "contribution", here's some solid intel re Nork submarines and their bases at Sinpo:

As I mentioned earlier, at coordinates

Latitude: 40.025417°
Longitude: 40.025417°

DPRK's lone "Gorae"-class SSB is docked in its own pen at Sinpo:

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The main Nork submarine base is on the island immediately offshore from Sinpo city.

The colors in the graphic above are wrong. Operational Romeos (at top in poster, above) are equipped with a dark gray anechoic coating. Romeo refits -- including adding the anechoic coating -- are done in the drydock on the island, at

Lat: 39.997814°
Lon: 128.200215°

At left, a Romeo is in the drydock, being refurbished,, while two more are moored, awaiting refit. At right, the drydock is flooded, and the refurbished Romeo, with its new dark gray anechoic coating, is moored between two other Romeos. (Note the three mini-subs now moored at middle left...)

To the northwest of the drydock, there is a large cove, with several submarine mooring sites.

At lower left (Lat: 39.993408°, Long: 128.210340°) there is a pier that usually has several Romeos and, possibly mini-subs, moored alongside.

At middle right, (Lat: 39.996114°, Long: 128.214940°) there is a dock that usually has at least five Romeos moored alongside.

At top center in this photo, there is a Romeo, returning from patrol.

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To the northeast (upper right) of this photo, at Lat: 40.000053°, Lon: 128.218490°, there s a dock complex where several minisubs and patrol boats -- plus the occasional frigate -- are usually docked:

Occasionally re-visiting the coordinates provided above, plus using Google Earth's "Time Slider" (clock icon on menu bar) can provide interesting intel re the activities of DPRK's submarine fleet.

TXnMA