The Cold Half

The waters off the southern coast of Hong Kong Island possess a deceptive serenity, hiding the deep-channel dynamics that once dictated the maritime expansion of the region. As you swim the 15km route from Stanley to Repulse Bay, you traverse the threshold of the South China Sea, where the depth and shifting currents of Victoria Harbour exert a subtle influence on the passage. This stretch of ocean has long served as a corridor for trade, evidenced by the archaeological remnants—such as copper coins from the Sui, Tang, and Song dynasties—found near the coastal transit points. The race follows a line that reflects centuries of human movement, passing landmarks that have been preserved through careful relocation, such as the historic roof structure of the Blake Pier, which now stands as a maritime monument in Stanley.

Historical currents and landmarks

Navigating this route requires an awareness of the island's complex past. In 1661, the Qing dynasty implemented the Great Clearance, forcing inhabitants inland and leaving these coastal waters largely abandoned for nearly a decade; today, the shoreline retains signs of that era's isolation. As you push toward Repulse Bay, keep a lookout for the ancient rock carvings at Big Wave Bay, which remain as markers of the area's earliest inhabitants. The route also skirts the periphery of the Cape D'Aguilar Marine Reserve, a protected zone that highlights the biodiversity present beneath the surface. You will pass the enduring silhouette of the old Stanley Police Station, a building that served as a local headquarters during the Japanese occupation in 1941, during the time of the intense combat known as 'Black Christmas'.

Race day logistics

The event offers a 15km marathon swim, a 1.5km Cold Plunge, and a 400m sprint, all scheduled for late January. The 15km marathon requires a mandatory support boat or kayak, as the open sea conditions demand dedicated navigation. For those prioritizing the challenge of a long-distance effort, this race shares a seasonal window with the Clean Half, which continues the tradition of demanding marathon swims in these waters. Swimmers under 16 are required to wear a wetsuit if the water temperature drops below 20 °C (68 °F), though both wetsuit and non-wetsuit categories are available across all distances to accommodate different thermal strategies. The event, organized by AVRA and 26 Coaching, provides chip-timing, post-race nutrition, and a medal, ensuring that the logistical support matches the intensity of the winter swim.