them withstand the natural motion of the towers, and each joint has a unique range of motion. The total range of motion is . In addition to wind, the hotel towers are also subject to settlement in the earth over time, so engineers built and installed custom jack legs to allow for future adjustment at more than 500 points beneath the pool system. This jacking system is important primarily to ensure the infinity edge of the pool continues to function properly. Opening Marina Bay Sands was originally planned to be completed in a single phase in 2009, but rising construction costs and the financial crisis forced the company to open it in phases. The first phase's preview opening was further delayed until 27 April 2010, and the official opening was pushed back to 23 June 2010. The rest of the complex remained under construction and was opened after a grand opening on 17 February 2011. On 27 April 2010, Marina Bay Sands had the first of a planned 3 to 4 phase openings. The casino, parts of the conference hall, a segment of the Shoppes, 963 hotel rooms and the event plaza were opened at the auspicious time of 3:18 p.m as part of the "preview opening". The Inter-Pacific Bar Association (IPBA) held the first conference at Marina Bay Sands Convention Centre on 2–5 May 2010, but the event was marred by uncompleted facilities and power failure during a speech. IPBA withheld payment of S$300,000 and was consequently sued by Marina Bay Sands. In June IPBA counter-sued, describing the venue as a "complete disaster" and that its earlier payments had been imposed by "duress, fear and force". An "amicable settlement" with undisclosed terms was announced in August. On 23 June 2010, the resort had its official opening with a "2-day celebration"; this includes the Sands SkyPark, the Event Plaza along Marina Bay, more shops, additional dining options and nightlife offerings, and the rest of the hotel rooms. First day events included a "World Championship Climb" on the glass facade of the building to the SkyPark, with seven teams of 21 top rock climbers from around the world competing, and an evening concert for 4,000 invited guests and customers, featuring one international rapper such as Kelly Rowland and one national contemporary R&B such as Sylvia Ratonel. The SkyPark was opened on the second day at 2 p.m., with about 2,000 adult