Quest "the Depths"

hey doods, im trying to find the treasure map in the skull to the entrance of the island, and I cant seem to find it... im ok with getting past the part where you have to drop the emerald block in though... can someone please help?

 

After activating the emerald system, you need to quickly find the hidden entrance which opens up as you approach it.

Spoiler: If you're still struggling with it, read this

The hidden door is directly in front of the path opened by emeralds; Keep going straight after the stairs, turn only when you're forced to, and go straight.

 

thanks!