Bomb disposal experts have warned folk that a washed up ordnance presents a “small explosive hazard” and must not be touched.
A specialist Royal Navy team is expected to arrive in Shetland on Wednesday to dispose of the item, which was discovered by a walker near the point of Grunataing in the Walls area on Saturday.
The coastguard has set up a cordon around the ordnance until the experts arrive.
The Royal Navy confirmed today that its team from the Clyde-based Northern Diving Group will travel to Shetland to dispose of the item.
In a statement the navy said: “From photographs, the item appears to be a marine smoke marker; however, this will not be confirmed until a full examination has taken place.”
The team last visited in August after a Canadian pipe mine was uncovered at Scatsta airport. A 1,300m cordon was set up and an explosion could be seen from miles around.
The navy said the disposal on Wednesday was unlikely to be very spectacular.