Coming October 6, 2012. Swim Hong Kong? Yep, the Clean Half Marathon Swimming Open Water Relay Hong Kong Bay takes you from Stanley to Deepwater Bay through the Hong Kong’s south side. There are categories for both solo and 5-person relay teams. For relays, the swimmers rotate about every 20 minutes. The distance is 9 miles (14.5K), and the water temperature is typically 71°–81°F (22°–27°C) at this time of year. Keep in mind that there can be large swells in Hong Kong Bay, but this is definitely one of those iconic opportunities that we just couldn’t pass-up sharing.