HMSColossus, an Experimental Site Stabilization

Abstract

HMS Colossus, a 74-gun warship, sank in the Isles of Scilly in 1798. The stern half of this vessel became exposed on the seabed some time around 2001. The timbers of the wreck were in excellent condition when first exposed but quickly began to deteriorate, mainly due to attack by wood-boring organisms. In 2003 English Heritage commissioned a two-year stabilization trial project on the site. These trials were aimed at determining the most effective method of protecting the exposed timbers of the wreck. Three different methods of protection were trialled, all of which had been used previously elsewhere. One of these methods, a Terram 4000 mat, was clearly the most effective on this site. In 2008, a small area of the wreck was covered with a Terram 4000 mat to determine the long-term efficacy of this means of site stabilization. Prior to installation the area to be covered was recorded in detail, along with an adjacent area as a control, to facilitate future comparison of the condition of the ship's timbers. This work, too, was commissioned by English Heritage (Camidge 2008).

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