Wreck Marking

Trinity House has a statutory responsibility to mark and, if necessary, remove wrecks which are a danger to navigation.

THV Alert Video

Highlighting the capabilities of our Rapid Intervention Vessel, THV Alert, this video demonstrates Trinity House's role in the marking of wrecks and shows how the Emergency Wreck Marking Buoy is deployed.

Click below to view the video.

You need Adobe Flash player to view this content. Click here to get the player. Below is a transcript of the video.

Video Transcript

Intro: Sound of Alert being called on the radio by the Operations and Planning Centre (OPC) at Trinity House Harwich.

Unfortunately there has been an incident at sea and a large vessel has sunk off the East Coast.

(Alert is directed to proceed to the Dover Strait)

At Harwich, the Trinity House Operations and Planning Centre, manned 24 hours a day, is coordinating the response to marking the wreck.

Trinity House’s Rapid Intervention Vessel Alert is called into port to begin loading Emergency Wreck Buoys.

Alert is a state of the art vessel designed with buoy handling, wreck marking, towing and multi-beam and hydrographic surveying capability.

Alert leaves for the wreck site complete with Emergency Wreck Buoys and is updated on the situation en-route.

At 39.3 metres long, she is fitted with a range of high specification survey equipment and to the highest technical standards.

With DP1 dynamic positioning, a service speed of 15 knots and a maximum speed of 17 knots, Alert is deployed primarily to cover the South East coast including the Dover Strait – the busiest shipping lane in the world where she is able to respond rapidly to any maritime incident.

Alert locates the wreck using her multi-beam survey equipment.

Once the wreck has been located, Alert deploys Emergency Wreck Buoys around the wreck and will remain at the site using her Radar Beacon to act as an additional warning to shipping of the existence of the wreck.

Alert will stay at the wreck site with the Emergency Wreck Buoys until the larger Trinity House vessel arrives with permanent wreck marking buoys.