diff --git a/src/fr/neatmonster/nocheatplus/checks/fight/Critical.java b/src/fr/neatmonster/nocheatplus/checks/fight/Critical.java
index decc3d77..89cd5df2 100644
--- a/src/fr/neatmonster/nocheatplus/checks/fight/Critical.java
+++ b/src/fr/neatmonster/nocheatplus/checks/fight/Critical.java
@@ -54,7 +54,7 @@ public class Critical extends Check {
 
         // Check if the hit was a critical hit (positive fall distance, entity in the air, not on ladder, not in liquid
         // and without blindness effect).
-        if (player.getFallDistance() > 0f && !location.isOnGround() && !location.isOnLadder() && !location.isInLiquid()
+        if (player.getFallDistance() > 0f && !location.isOnGround() && !location.isOnClimbable() && !location.isInLiquid()
                 && !player.hasPotionEffect(PotionEffectType.BLINDNESS)){
             // It was a critical hit, now check if the player has jumped or has sent a packet to mislead the server.
             if (player.getFallDistance() < cc.criticalFallDistance
diff --git a/src/fr/neatmonster/nocheatplus/checks/moving/SurvivalFly.java b/src/fr/neatmonster/nocheatplus/checks/moving/SurvivalFly.java
index 34e26b94..48f8d8a5 100644
--- a/src/fr/neatmonster/nocheatplus/checks/moving/SurvivalFly.java
+++ b/src/fr/neatmonster/nocheatplus/checks/moving/SurvivalFly.java
@@ -45,6 +45,8 @@ public class SurvivalFly extends Check {
 	public static final double swimmingSpeed    = 0.11D;
 	public static final double webSpeed         = 0.105D; // TODO: walkingSpeed * 0.15D; <- does not work
 	
+//	public static final double climbSpeed      = sprintingSpeed; // TODO.
+	
 	public static final double modIce			= 2.5D;
 	
 	/** Faster moving down stream (water mainly). */
@@ -248,8 +250,50 @@ public class SurvivalFly extends Check {
         	}
         	if (vDistanceAboveLimit > 0) tags.add("vweb");
         }
-        // else if (verticalFreedom <= 0.001 && from.isOnLadder) ....
-        // else if (verticalFreedom <= 0.001 (?) & from.isInFluid
+//        else if (data.verticalFreedom <= 0.001 && from.isOnClimbable()){
+//        	// Ladder types.
+//        	// TODO: make these extra checks to the jumpphase thing ?
+//        	if (fromOnGround) vAllowedDistance = climbSpeed + 0.3;
+//        	else vAllowedDistance = climbSpeed;
+//        	vDistanceAboveLimit = Math.abs(yDistance) - vAllowedDistance;
+//        	if (vDistanceAboveLimit > 0) tags.add("vclimb");
+//        }
+//        else if (data.verticalFreedom <= 0.001 && from.isInLiquid()){
+//        	// Swimming...
+//        	// TODO: This is more complex, depends on speed of diving into it.
+//        	if (yDistance >= 0){
+//        		// TODO: This is more simple to test.
+//        		if (!to.isInLiquid()){
+//            		vAllowedDistance = swimmingSpeed + 0.3;
+//        		}
+//        		else{
+//            		vAllowedDistance = swimmingSpeed;
+//
+//        		}
+//        		vDistanceAboveLimit = yDistance - vAllowedDistance;
+//        		if (vDistanceAboveLimit > 0) tags.add("swimup");
+//        	}
+//        	else{
+//        		// TODO
+//        		if (-yDistance > swimmingSpeed * modDownStream){
+//        			if (data.sfLastYDist != Double.MAX_VALUE && yDistance - swimmingSpeed <= data.sfLastYDist){
+//        				// Expect to get less as much as swimming speed (heuristic).
+//        				vAllowedDistance = Math.abs(data.sfLastYDist) - swimmingSpeed; // Just for reference.
+//        				vDistanceAboveLimit = -yDistance - swimmingSpeed; // TODO
+//        				if (vDistanceAboveLimit > 0) tags.add("swimdown");
+//        			}
+//        			else{
+//        				// Ignore.
+//        				vDistanceAboveLimit = 0;
+//        				vAllowedDistance = Math.abs(yDistance);
+//        			}
+//        		} else{
+//        			// Ignore.
+//    				vDistanceAboveLimit = 0;
+//    				vAllowedDistance = Math.abs(yDistance);
+//        		}
+//        	}
+//        }
         else{
         	// Check traveled y-distance, orientation is air + jumping + velocity (as far as it gets).
         	vAllowedDistance = (!(fromOnGround || data.noFallAssumeGround) && !toOnGround ? 1.45D : 1.35D) + data.verticalFreedom;
diff --git a/src/fr/neatmonster/nocheatplus/utilities/BlockProperties.java b/src/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
index 01c8225d..8d755a2e 100644
--- a/src/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
+++ b/src/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
@@ -269,6 +269,8 @@ public class BlockProperties {
      * NOTE: This should later be ignored by passable, rather.
      */
     public static final int F_HEIGHT100     = 0x100;
+    /** Climbable like ladder and vine (allow to land on without taking damage). */
+    public static final int F_CLIMBABLE     = 0x200;
     
 	static{
 		init();
@@ -361,6 +363,12 @@ public class BlockProperties {
         }){
             blockFlags[mat.getId()] |= F_HEIGHT150;
         }
+        // Climbable
+        for (final Material mat : new Material[]{
+                Material.VINE, Material.LADDER,
+        }){
+            blockFlags[mat.getId()] |= F_CLIMBABLE;
+        }
         // Workarounds.
         for (final Material mat : new Material[]{
                 Material.WATER_LILY, Material.LADDER,
@@ -1023,7 +1031,7 @@ public class BlockProperties {
     }
     
     /**
-     * 
+     * Test if the bounding box overlaps with a block of given flags (does not check the blocks bounding box).
      * @param box
      * @param flags Block flags (@see fr.neatmonster.nocheatplus.utilities.BlockProperties). 
      * @return If any block has the flags.
@@ -1033,7 +1041,7 @@ public class BlockProperties {
     }
     
     /**
-     * 
+     * Test if the bounding box overlaps with a block of given flags (does not check the blocks bounding box).
      * @param minX
      * @param minY
      * @param minZ
@@ -1049,7 +1057,7 @@ public class BlockProperties {
 
     
     /**
-     * 
+     * Test if the bounding box overlaps with a block of given flags (does not check the blocks bounding box).
      * @param minX
      * @param minY
      * @param minZ
diff --git a/src/fr/neatmonster/nocheatplus/utilities/PlayerLocation.java b/src/fr/neatmonster/nocheatplus/utilities/PlayerLocation.java
index 1bfcb2f4..3aab2506 100644
--- a/src/fr/neatmonster/nocheatplus/utilities/PlayerLocation.java
+++ b/src/fr/neatmonster/nocheatplus/utilities/PlayerLocation.java
@@ -72,7 +72,7 @@ public class PlayerLocation {
 	private Boolean onIce;
 
 	/** Is the player on ladder? */
-	private Boolean onLadder;
+	private Boolean onClimbable;
 
 	/** Simple test if the exact position is passable. */
 	private Boolean passable;
@@ -285,12 +285,15 @@ public class PlayerLocation {
 	 * 
 	 * @return If so.
 	 */
-	public boolean isOnLadder() {
-		if (onLadder == null) {
-			final int typeId = getTypeId();
-			onLadder = typeId == Material.LADDER.getId() || typeId == Material.VINE.getId();
+	public boolean isOnClimbable() {
+		if (onClimbable == null) {
+			// Climbable blocks.
+			onClimbable = typeId == Material.LADDER.getId() || typeId == Material.VINE.getId();
+			// TODO: maybe use specialized bounding box.
+//			final double d = 0.1d;
+//			onClimbable = BlockProperties.collides(getBlockAccess(), minX - d, minY - d, minZ - d, maxX + d, minY + 1.0, maxZ + d, BlockProperties.F_CLIMBABLE);
 		}
-		return onLadder;
+		return onClimbable;
 	}
 
 	/**
@@ -357,7 +360,7 @@ public class PlayerLocation {
 	 */
 	public boolean isResetCond(){
 		// NOTE: if optimizing, setYOnGround has to be kept in mind. 
-		return isInLiquid()  || isOnLadder() || isInWeb();
+		return isInLiquid()  || isOnClimbable() || isInWeb();
 	}
 
 	public double getyOnGround() {
@@ -516,7 +519,7 @@ public class PlayerLocation {
 
 		// Reset cached values.
 		typeId = typeIdBelow = data = null;
-		aboveStairs = inLava = inWater = inWeb = onGround = onIce = onLadder = passable = null;
+		aboveStairs = inLava = inWater = inWeb = onGround = onIce = onClimbable = passable = null;
 
 		// TODO: Consider blockCache.setAccess? <- currently rather not, because
 		// it might be anything.