At about 8:30 a.m. on February 11, 2025, four employees were removing a 5-foot-long waster sleeve from under a vessel. A raised platform was being used to allow a pneumatic jack to press out the waster sleeve. The employees stacked four wooden blocks, about 12 inches by 12 inches by 51 inches, and placed a 3/8-inch blank plate on the blocks. They then placed the pneumatic jack on the top of the blank to press up the waster sleeve from the underside of the vessel. The jack was put into action, but the waster sleeve did not move. The block structure became unstable, collapsed, and struck an employee in the lower left shin area. The employee developed swelling in the lower leg that resulted in hospitalization for compartment syndrome that required surgery.