Chrono Trigger Prerelease
Judging from its looks, Heckran Cave was originally a huge complex with planned whirlpools for travel, much like the sand blowholes of Earth Dragon Isle. Much of this was redone and scrapped. If events are enabled, one can see a strange set of eyes on one of the walls; it is the same sprite used in Norstein Bekkler's tent that appears behind the bars. One appears in Guardia Castle as well. Broken Jinn Bottles litter the ground, and when activated, provide some dialogue and attack. Lastly, one can fight OctoRiders here (this enemy did not appear in the final version).
Thanks to The Cutting Room Floor
Romaji: Nishi no yama no daakutsu
Translation: Western Mountain Cave
Thanks to Heian-794, JLukas
From: Locations (CTP)