It's truly impressive and worth the visit, though a bit strenuous. Those with limited mobility should avoid wheelchairs, crutches, or strollers. The walk up and down stairs is dimly lit and the ground is wet.
From the Baiheliang Underwater Museum, take the No. 113 bus from the bus stop opposite the museum. It runs every 20 minutes (2 yuan). From the Wujiang Bridge West Station, take the No. 208 or No. 208C bus to the Baitao Old Street intersection (the stop is opposite where you get off, and it runs every half hour, so plan your time accordingly). The ride takes about 70 minutes. The 816 Project Visitor Center is just 20 meters away. While waiting for the bus on the way there, I met a young couple and offered to share a ride with them on the return trip. We took a taxi from the 816 entrance to Fuling North Station, which was perfect for four people. The taxi cost 33 yuan per person (including highway tolls, a total of 132 yuan, which is a bit steep. If you have more time, you can also take the bus back to Fuling North Station). You have to pay by credit card both on and off the bus, which costs 4 yuan. There is a gas station near the tourist center, and mineral water is very cheap at 2 yuan.