The locking bolt remained attached to the actuating cylinder piston rod, which was bent . The remains of the attachment lugs and the locking bolt were removed from the wreck during the diving operation for close investigation.
It was noted that the weld beads between the lugs and the bolt housing and the support bushing respectively had failed partly in the bead itself and partly in the fusion zones. The steel plate of the lugs had failed in their thinnest sections, generally in a forward-upward direction. The two lugs for the bolt housing were twisted towards the port side.
When the locking bolt was removed from the actuator piston rod, the actuator was in fully extended, i.e. locked, position. The piston rod was bent upwards, away from the forepeak deck. The hydraulic hoses were connected. The bolt was checked for wear and deformation. The bolt was straight. The general diameter of the bolt was about 78 mm. Only a slight variation in diameter was measured at the contact area between the bolt and the visor lug. No other damage to the bolt was noted.
The mating lug in the visor was attached to the structure but was bent about ten degrees to starboard and the adjacent structure was deformed and cracked). The hole in the lug for the locking bolt had an original diameter of 85 mm while after the accident the hole was oval with dimensions at mid-thickness about 83 x 95 mm. The visor lug was removed from the visor after it had been brought ashore.
The recovered parts have been investigated with regard to properties of the material and characteristics of the fracture surfaces and deformations.