Introduction

A prototype  vessel (Figure 1) makes use of an internal ballast system whereby lead bars are  placed in the hull, and a polyester resin is poured on top to prevent movement  of the system (Figure 2).  Various  deposits were found on the top of the internal ballast system.

Introduction

The hull of a vessel failed while at sea. The failure of the hull appears to have developed along a corner between the side and underneath of the hull.