Hi Pedro, I am at the end of the mission, just before entering the maze where the "secret door" is. SinisterShadow said that in order to open that door you have to look underwater, but I cannot find a switch or anything to open the door.........

DML1
//T2 FM: Mysterious Invitation by PsymH / Fixes: miss20.mis.dml

//doors
ObjProp 9 "TransDoor"
{
"Open Position" -10.00
}
ObjProp 164 "RotDoor"
{
"Open Angle" 89
}
ObjProp 166 "RotDoor"
{
"Open Angle" 271
}
ObjProp 167 "RotDoor"
{
"Open Angle" 271
}
ObjProp 169 "RotDoor"
{
"Open Angle" 89
}
ObjProp 269 "RotDoor"
{
"Open Angle" 271
}
ObjProp 270 "RotDoor"
{
"Open Angle" 89
}
ObjProp 383 "TransDoor"
{
"Open Position" -10.00
}
-ObjProp 505 "JointPos"
+ObjProp 848 "PhysCanMant"
{
}
-ObjProp 848 "PhysType"
+ObjProp 848 "PhysType"
{
"Type" OBB
}
ObjProp 2642 "RotDoor"
{
"Open Angle" 89
}
ObjProp 2644 "RotDoor"
{
"Open Angle" 271
}
ObjProp 2674 "RotDoor"
{
"Open Angle" 89
}
ObjProp 2868 "RotDoor"
{
"Open Angle" 89
}
ObjProp 2872 "RotDoor"
{
"Open Angle" 89
}

//windows
Create -445 "Blocker1"
{
+ObjProp "CollisionType"
{
"" None
}
+ObjProp "PhysCanMant"
{
"" false
}
-ObjProp "PhysType"
+ObjProp "Position"
{
"Location" 209.35, 608.3, -71
"Bank" c000
}
+ObjProp "PhysType"
{
"Type" OBB
}
+ObjProp "RenderType"
{
"" Not Rendered
}
+ObjProp "Material Tags"
{
"1: Tags" ""
}
}
Create -445 "Blocker2"
{
+ObjProp "CollisionType"
{
"" None
}
+ObjProp "PhysCanMant"
{
"" false
}
-ObjProp "PhysType"
+ObjProp "Position"
{
"Location" 209.35, 588.8, -71
"Bank" c000
}
+ObjProp "PhysType"
{
"Type" OBB
}
+ObjProp "RenderType"
{
"" Not Rendered
}
+ObjProp "Material Tags"
{
"1: Tags" ""
}
}
+ObjProp 258 "BlockFrob"
{
"" true
}
+ObjProp 790 "BlockFrob"
{
"" true
}
+ObjProp 793 "BlockFrob"
{
"" true
}
+ObjProp 1192 "BlockFrob"
{
"" true
}

//AIs
+ObjProp 318 "InvRendType"
{
"Type" Alternate Bitmap
"Resource" cnoblem4
}
+ObjProp 2876 "InvRendType"
{
"Type" Alternate Bitmap
"Resource" assaca
}
+ObjProp 2877 "InvRendType"
{
"Type" Alternate Bitmap
"Resource" assaca
}

//frogbeast / captain's office key
+Receptron 459 "Knockout"
{
Min None
Max None
Effect "Abort"
}

//duncan's heart
-ObjProp 1060 "PickDist"
+ObjProp 2165 "BlockFrob"
{
"" true
}

//control panel
-Link 1671 1592 "ControlDevice"
+Link 1671 1586 "ControlDevice"
{
}
+Link 1671 1897 "ControlDevice"
{
}
+ObjProp 1671 "JointPos"
{
"Joint 4" 0.95
}
ObjProp 1671 "StTweqJoints"
{
"AnimS" Reverse
"Joint4AnimS" On, Reverse
}

//deer leg
-ObjProp 608 "PhysType"
ObjProp 608 "Position"
{
"Location" 221.3, 598, -74.3
}

//gas arrows
ObjProp 792 "Position"
{
"Location" -89.52, 328.2, 13.9
}

//banners
Create -535 "PBanner"
{
+ObjProp "Position"
{
"Location" -7.4, 33.85, 34
}
+ObjProp "Scale"
{
"" 0.5425, 1, 1.127
}
}
-ObjProp "PBanner" "PhysType"
+ObjProp "PBanner" "PhysType"
{
"Type" OBB
}
ObjProp 1641 "Position"
{
"Location" 7.38, 33.85, 34
}
-ObjProp 1641 "PhysType"
+ObjProp 1641 "PhysType"
{
"Type" OBB
}