In November 2010, workers started testing the north pool's waterfall. Construction progressed significantly through the spring of 2011. In March 2011, the installation of glass panels on the museum pavilion's façade began, and in May 2011, workers started testing the south pool's waterfall. Most of the memorial was finished in time for the 10th anniversary of the terrorist attacks, with the museum slated for completion one year later. By September 2, 2011, more than 242 trees had been planted at the site, while 8 more were planted before the memorial opened. By then, both pools had been completed, and were tested daily to ensure that the waterfalls were working. On September 12, 2011, one day after the 10th anniversary of the September 11 terrorist attacks, the memorial officially opened to the public. Work continues on the museum, which will be completed by September 2012.