His Majesty's Coastguard in the UK and the General Lighthouse Authority have been contacted
The coastguard says the Safe Water Mark is around ten feet tall.
The UK Coastguard and the General Lighthouse Authority have been informed, and plans are in place to recover it.
People are being warned not to approach or touch the structure, as it is insecure and could topple.
Union says it's been 'stonewalled' by DOI over bus driver strikes
Sunlight reflecting from mirror sparks carpet fire
Douglas Council must provide new response to FOI about former nurses home