How do I secure a cave entrance?

[NOOBY93]

Is it possible for another player to walk through the cave, exit through my entrance and enter my claim?

walk through the cave, exit through my entrance

enter my claim?

[MagicManICT]

You can also put up a pali or BW corner post at other entrances to the cave to keep people out. (Put up a small claim with an alt to keep them from decaying.)

Done the latter part and pallied the claims, but didn't think about the cp at the entrances - brilliant, thanks!

Just a general FYI: do note that this doesn't prevent anyone from dropping a minehole into your secured area if you don't have it secured properly. (Forget what the rules are for building a minehole into mined out areas and caves are, though.)

[Flameturtle]

Just ensure you have the access into the 50 tiles around your cave entrance are walled in, so its walled in where other players are unable to mine.