void main()
{

object oPC = GetLastUsedBy();

if (!GetIsPC(oPC)) return;

int DoOnce = GetLocalInt(oPC, GetTag(OBJECT_SELF));

if (DoOnce==TRUE) return;

SetLocalInt(oPC, GetTag(OBJECT_SELF), TRUE);

ActionSpeakString("The air here seems strangely warm and humid. The tunnel seems to have been cleared of debris, although the stone floor shows no footprints. Ahead, the corridor branches.");

}