This image was definitely fun. The seaweed that you can see so sharply on the picture made me fall on my butt twice on the same spot (my coat needs washing now). Image post-processing has taken at least 2 hours and 3 editing programs.
The iron debris on the shore is the capstan from a ship. It's called 'spil' in Icelandic. This one came from an English trawler that was shipwrecked a few decades ago.
ISO 100 ; f/22 ; 1/30 ; @14mm