The mining of coal directly below Hamilton Mausoleum caused serious subsidence and damage to the 10th Duke of Hamilton's final 'folie de grandeur'. In April 1921, the ducal trustees obtained permission from Hamilton Sheriff Court to remove all the bodies from the endangered structure.

The remains of the two most recent Dukes - the 11th and 12th - were taken to their beloved Isle of Arran for burial, but all the other members of the family were interred in a large grave adjoining the local cemetery. On 13 October 1921, the Egyptian sarcophagus containing the 10th Duke, together with all the other coffins in the crypt, were transported to Bent Cemetery, on a lorry, by Wylie & Lochhead of Glasgow, with assistance from estate workers. A short service of commemoration was held the following afternoon, with just the flat tops of two of the coffins visible, 'the other coffins being covered'.

A large monument records that the grave contains James, Lord Hamilton (d.1479); the 1st Marquess of Hamilton; the 1st, 4th, 5th, 6th, 7th, 8th, 9th and 10th Dukes of Hamilton; the wives of the 9th and 10th Dukes; and three sons of the 4th, 9th and 11th Dukes. Only a high hedge separates these 'Most High and Puissant Princes' from very ordinary folk and that other famous celebrity in Bent Cemetery: the entertainer Sir Harry Lauder.