assist assistance buoyancy circle circular flotation device help kisby ring life preserver life saving buoy lifebelt lifebuoy lifering lifesaver perry buoy red and white rescue rescue aid rescue device ring buoy safety safety device security boat life-buoy saver secure ship water blue buoy guideline life red reflection sun air bench board ferry sea transportation travel advice alert announcement be-careful beware black care caution communicating communication danger flotation-device information informing kisby-ring lettering life-preserver life-saving-buoy message no-lifeguard perry-buoy personal-protective-equipment pool rescue-aid rescue-device ring-buoy risk risks risky safety-device sign signage swim swimming swimming-pool warning warning-sign white captain certified drill drown drowning emergency evacuation flashlight float flotation found guaranteed lifeboat light lost man overboard on board overboard preserve preserver rescued restored ring safe save seaworthy sink vessel wave waves Australia bay bench seats boats buoys business district CBD city city scapes city views commuter commuting expanse of water harbor harbour high rise masts Melbourne motor boats navigation office buildings passenger Port Phillip Bay sailing ships sailors ships sight-seeing tourism Victoria views Williamstown hedge post ropes round saftey shrubs trees wall