According to the emergency services the man fell into the water by the sluice, one of the main water junctions from Lake Mälaren and the Baltic sea. The man is now missing, with fears that he was sucked through the floodgates and subsequently drowned.
Witnesses report the man voluntarily walked out onto the water to balance on some floating logs when he fell in the still bracing waters of the lake.
The man was heard calling for help as he was sucked through a drainage hole adjoining the lock and disappeared out into the Baltic.
Several rescue services boats searched the area for over an hour on Tuesday but to no avail and personnel have concluded that the man has probably drowned.
“There is no hope of finding anyone alive,” said Lars Lindberg at the Stockholm fire services to news agency TT.