Police said locals saw Victor Zkmieziv, 32, urinating on Sapan Pak Lak bridge on Nanai Road in Patong around 4.20am yesterday (December 24).
Locals said they saw him fall asleep, after which he tumbled down the steep ditch under the bridge, falling around 3 metres, and hitting his head.
They managed to bring him up to the road and called emergency services, and he was taken to Patong Hospital for treatment.