The Blue Hole
I did not do the dive. However, dangers include that the blue hole is connected to the sea by a tunnel that appears shorter than it is – due to the cl...
Bosögrundet
I Askrikefjärden, norr om Lidingö. Grynnan är märkt på sjökortet, men ligger bara 50-70 cm under vattenytan. Grynnan ligger endast 70 cm under vatteny...