Can you find? A 5ft cellar door

The green door led into a document "strong room" was made of metal salvaged (bolts, T iron braces and iron shelves formed from heavy wrought iron plates from the Benvenue wreck. The foundations of the strong room are still there, it was designed by Mr Ross to be fire proof. It is sunk to the depth of 15 feet from the ground line, and built of solid bluestone masonry and concrete