Erin Janus - One of the openings to an underground naval base in Sweden on the island of Muskö. The underground base itself has an area of several kilometers and is connected
![Unesco world heritage sight the Naval base of Karlskrona, Sweden - License, download or print for £49.50 | Photos | Picfair Unesco world heritage sight the Naval base of Karlskrona, Sweden - License, download or print for £49.50 | Photos | Picfair](https://res.cloudinary.com/fleetnation/image/private/c_fit,w_1120/g_south,l_text:style_gothic2:%C2%A9%20robertharding,o_20,y_10/g_center,l_watermark4,o_25,y_50/v1546515802/ksd5mhzp4eqbrpj7e02f.jpg)
Unesco world heritage sight the Naval base of Karlskrona, Sweden - License, download or print for £49.50 | Photos | Picfair
![HSwMS Trossö A264 auxiliary ship in Karlskrona örlogsbas (Karlskrona naval base) and wooden Amiralitetskyrkan (Admiralty Church) built in 1685 as a ch Stock Photo - Alamy HSwMS Trossö A264 auxiliary ship in Karlskrona örlogsbas (Karlskrona naval base) and wooden Amiralitetskyrkan (Admiralty Church) built in 1685 as a ch Stock Photo - Alamy](https://c8.alamy.com/comp/T1DB9D/hswms-tross-a264-auxiliary-ship-in-karlskrona-rlogsbas-karlskrona-naval-base-and-wooden-amiralitetskyrkan-admiralty-church-built-in-1685-as-a-ch-T1DB9D.jpg)
HSwMS Trossö A264 auxiliary ship in Karlskrona örlogsbas (Karlskrona naval base) and wooden Amiralitetskyrkan (Admiralty Church) built in 1685 as a ch Stock Photo - Alamy
![Karlskrona, Sweden - August 03, 2015: Two Visby Class Swedish Navy Stealth Corvettes Moored At The Naval Base Harbor As Seen From The Water Looking In. Stock Photo, Picture And Royalty Free Image. Image 48113806. Karlskrona, Sweden - August 03, 2015: Two Visby Class Swedish Navy Stealth Corvettes Moored At The Naval Base Harbor As Seen From The Water Looking In. Stock Photo, Picture And Royalty Free Image. Image 48113806.](https://previews.123rf.com/images/imfoto/imfoto1508/imfoto150800010/48113806-karlskrona-sweden-august-03-2015-two-visby-class-swedish-navy-stealth-corvettes-moored-at-the-naval-.jpg)