Tides will kill you! From most of the tidals I've done Sydney is not too bad though but make sure you know what's coming before you go underground and also pay attention to the previous water marks at the tidal entry as it will help you determine if you will drown or be able to swim out. ALWAYS check the tides first thoughmaggot wrote:Yer, what he said. Tidal drains can drown you if there's no alternate way out when the tide comes in. (Plus there's usually oysters and slimey crap everywhere!)
http://www.bom.gov.au is your friend.