Question: When was the final tunnel joint installed on the only way across the Lingdingyang other than the Humen Pearl River Bridge?
Context: Shiziyang () or Shizi Channel, the upper channel of the Pearl River estuary, it runs from the confluence of the Dong River and the Pearl River with parts of the Bei River to the Bocca Tigris which separate Lingdingyang the mid channel of the Pearl River Estuary in the south.  It is a wide tidal strait connecting the Huangpu New Port of Guangzhou to the South China Sea. The Huangpu New Port is located at the confluence of the Dong River and the Pearl River.  The Huangpu New Port is only part of the larger Port of Guangzhou.  Currently there is one rail tunnel (Shiziyang Tunnel) and one bridge (Humen Pearl River Bridge) crossing the Shiziyang. The Pit River Bridge (officially the Veterans of Foreign Wars Memorial Bridge) is a double deck, deck truss, road and rail bridge over Shasta Lake in Shasta County, California.  The bridge, carrying Interstate 5 on its upper deck and Union Pacific Railroad on its lower deck, was built in 1942 as part of the construction of the Shasta Dam/Shasta Lake reservoir system.  The Pit River Bridge was constructed to replace the Lower Pit River Bridge, as the rising waters of the Shasta Lake reservoir would have put the older bridge underwater.  The entire bridge spans 3588 ft long on the upper deck and 2754 ft on the lower deck.  With a height of 500 ft above the old Pit River bed, it is structurally the highest double decked bridge in the United States; however, today the bridge sits only about 40 ft above the water when Shasta Lake is full. Humen Town (), formerly Fumun, is a town in Dongguan city on the eastern side of the Humen strait on the Pearl River Delta, in Guangdong province, southern China.  The former town of Taiping was incorporated into Humen Town in 1985.  The population was 577,548 in the 2000 census, making it the second most populous town (zhèn) in China (after Chang'an in Dongguan as well). The Humen, known historically by Europeans as the Bocca Tigris or Bogue, is a narrow strait in the Pearl River Delta that separates Shiziyang in the north and Lingdingyang in the south near Humen Town in China's Guangdong Province.  It is the site of the Pearl River's discharge into the South China Sea.  It contains the Port of Humen at Humen Town.  The strait is formed by the islands of Chuenpi (穿鼻 ,  "Chuanbi") and Anunghoy (阿娘鞋 ,  "Aniangxie"; also called 威远 ,  "Weiyuan") on the eastern side, and Taikoktow (大角头,  "Dajiaotou") on the western side.  Since 1997, the strait has been traversed by the Humen Pearl River Bridge. The Beaver River Bridge (also called "Beaver Valley Bridge") is a bridge that carries the Pennsylvania Turnpike across the Beaver River in North Sewickley Township, Beaver County, Pennsylvania.  Built in 1951 and opened in 1952, the 65 -year-old bridge is being redesigned with construction of a new span not expected to begin until 2017 or later.  The Beaver River Bridge has a total length of 1546 ft and a clearance below of 170 ft making it higher than the Delaware River Bridge's 160 ft clearance on the PA Turnpike's eastern terminus in Bucks County, but lower than the Hawk Falls Bridge's 190 ft clearance on the Pennsylvania Turnpike's Northeast Extension in Carbon County.  The Beaver River Bridge is an example of a mid-20th century cantilever deck truss with preservation groups making efforts to save it from demolition as its structural style is becoming rare. The Humen Pearl River Bridge () is a bridge over the Humen, Pearl River in Guangdong Province, southern China.  It consists of two main spans - a suspension bridge section and a segmental concrete section.  It connects the Nansha District of Guangzhou to Humen Town of Dongguan.  Completed in 1997, the suspension bridge has a main span of 888 meters, and the segmental concrete section's main span of 237 meters is among the longest such spans in the world.  It forms part of the G9411 Dongguan–Foshan Expressway.  A newer bridge known as Humen Erqiao (Chinese:虎门二桥), built to reduce the traffic problems on the Humen Bridge, is under construction. The Hong Kong–Zhuhai–Macau Bridge (HKZMB) () is an ongoing construction project which consists of a series of bridges and tunnels crossing the Lingdingyang channel that will connect Hong Kong, Macau and Zhuhai, three major cities on the Pearl River Delta in China, the final tunnel joint having been installed on the 2nd of May, 2017.  The 50 km link is expected to cost US$10.6 billion (HK$83 billion).  With its length, it would become one of the landmarks within the area.  The longest bridge section will be 29.6 km long and will include three cable-stayed spans between 280 and . Lingdingyang () or Lingding Channel, the middle channel of the Pearl River estuary, it runs from Humen to Jiuzhouyang.  The Humen separates Lingdingyang and Shiziyang the upper channel of the Pearl River Estuary in the north and the Jiuzhouyang the lower channel of the Pearl River Estuary at the southern tip of Xiangzhou and the western tip of Lantau all the way till the southern end of the Wanshan Archipelago.  Currently, Humen Pearl River Bridge is the only bridge that crosses Lingdingyang at the northern end with Hong Kong–Zhuhai–Macau Bridge a bridge and tunnel across Lingdingyang is being built in the southern end of channel. The Lingdingyang Bridge () was proposed by former Zhuhai prefecture mayor in the late 1980s to link Zhuhai and Hong Kong at Qi'ao and Tuen Mun, across the Lingdingyang, Pearl River estuary. The Pearl River, also known by its Chinese name Zhujiang and formerly often known as the Canton River , is an extensive river system in southern China.  The name "Pearl River" is also often used as a catch-all for the watersheds of the Xi ("West"), Bei ("North"), and Dong ("East") rivers of Guangdong.  These rivers are all considered tributaries of the Pearl River because they share a common delta, the Pearl River Delta.  Measured from the farthest reaches of the Xi River, the Pearl River system is China's third-longest river, 2400 km , after the Yangtze River and the Yellow River, and second largest by volume, after the Yangtze.  The 409480 km2 Pearl River Basin (珠江流域 ) drains the majority of Liangguang (Guangdong and Guangxi provinces), as well as parts of Yunnan, Guizhou, Hunan and Jiangxi in China; it also drains northern parts of Vietnam's Northeast Cao Bằng and Lạng Sơn provinces.
Answer: 2nd of May, 2017