diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/check.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/check.mcfunction
new file mode 100644
index 000000000..61046aec8
--- /dev/null
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/check.mcfunction
@@ -0,0 +1,20 @@
+tag @s remove omegaflowey.player.room.is_within.back_cave
+tag @s remove omegaflowey.player.room.is_within.back_cave.waterfall_secret
+
+# back_cave
+tag @s[x=-157, dx=16, y=36, dy=12, z=18, dz=28] add omegaflowey.player.room.is_within.back_cave
+
+execute if entity @s[tag=!omegaflowey.player.room.back_cave, tag=omegaflowey.player.room.is_within.back_cave] run \
+  function omegaflowey.entity:player/room/underground/back_cave/enter
+execute if entity @s[tag=omegaflowey.player.room.back_cave, tag=!omegaflowey.player.room.is_within.back_cave] run \
+  function omegaflowey.entity:player/room/underground/back_cave/exit
+
+tag @s remove omegaflowey.player.room.is_within.back_cave.waterfall_secret
+
+# back_cave.waterfall_secret
+tag @s[x=-155, dx=7, y=43, dy=5, z=18, dz=8] add omegaflowey.player.room.is_within.back_cave.waterfall_secret
+
+execute if entity @s[tag=!omegaflowey.player.room.back_cave.waterfall_secret, tag=omegaflowey.player.room.is_within.back_cave.waterfall_secret] run \
+  function omegaflowey.entity:player/room/underground/back_cave/waterfall_secret/enter
+execute if entity @s[tag=omegaflowey.player.room.back_cave.waterfall_secret, tag=!omegaflowey.player.room.is_within.back_cave.waterfall_secret] run \
+  function omegaflowey.entity:player/room/underground/back_cave/waterfall_secret/exit
diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/enter.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/enter.mcfunction
new file mode 100644
index 000000000..a5e884e1b
--- /dev/null
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/enter.mcfunction
@@ -0,0 +1,2 @@
+function omegaflowey.main:telemetry/booth/add_tag { name: "room.underground.back_cave.enter" }
+tag @s add omegaflowey.player.room.back_cave
diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/exit.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/exit.mcfunction
new file mode 100644
index 000000000..423a63089
--- /dev/null
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/exit.mcfunction
@@ -0,0 +1,2 @@
+# function omegaflowey.main:telemetry/booth/add_tag { name: "room.underground.back_cave.exit" }
+tag @s remove omegaflowey.player.room.back_cave
diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/enter.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/enter.mcfunction
new file mode 100644
index 000000000..c02ea3d38
--- /dev/null
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/enter.mcfunction
@@ -0,0 +1,2 @@
+function omegaflowey.main:telemetry/booth/add_tag { name: "room.underground.back_cave.waterfall_secret.enter" }
+tag @s add omegaflowey.player.room.back_cave.waterfall_secret
diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/exit.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/exit.mcfunction
new file mode 100644
index 000000000..41c9c50ef
--- /dev/null
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/back_cave/waterfall_secret/exit.mcfunction
@@ -0,0 +1,2 @@
+# function omegaflowey.main:telemetry/booth/add_tag { name: "room.underground.back_cave.waterfall_secret.exit" }
+tag @s remove omegaflowey.player.room.back_cave.waterfall_secret
diff --git a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/check.mcfunction b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/check.mcfunction
index 5f2b20f95..37847f511 100644
--- a/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/check.mcfunction
+++ b/datapacks/omegaflowey/data/omegaflowey.entity/function/player/room/underground/check.mcfunction
@@ -23,4 +23,6 @@ execute if entity @s[tag=!omegaflowey.player.room.underground] run return 0
 execute unless score #omegaflowey.telemetry.enabled omegaflowey.global.flag matches 1 run return 0
 
 # TAG_SUMMIT_HARDCODED_PARKOUR_FULL
-execute if entity @s[x=-122, dx=27, y=41, dy=14, z=31, dz=14] run function omegaflowey.entity:player/room/underground/parkour/check
+execute if entity @s[x=-122, dx=27, y=41, dy=14, z=31, dz=14] run return run \
+  function omegaflowey.entity:player/room/underground/parkour/check
+function omegaflowey.entity:player/room/underground/back_cave/check
diff --git a/datapacks/omegaflowey/data/omegaflowey.main/function/telemetry/booth/schema/setup.mcfunction b/datapacks/omegaflowey/data/omegaflowey.main/function/telemetry/booth/schema/setup.mcfunction
index 233a579d7..5f60316d7 100644
--- a/datapacks/omegaflowey/data/omegaflowey.main/function/telemetry/booth/schema/setup.mcfunction
+++ b/datapacks/omegaflowey/data/omegaflowey.main/function/telemetry/booth/schema/setup.mcfunction
@@ -33,4 +33,6 @@ data modify storage omegaflowey:telemetry schema_booth_n set value { \
   'room.underground.parkour.before_final_jump.enter': 27, \
   'room.underground.parkour.finish.enter': 28, \
   'player.shown_feedback_link.won_fight': 29, \
+  'room.underground.back_cave.enter': 30, \
+  'room.underground.back_cave.waterfall_secret.enter': 31, \
 }