Index: source/graphics/Terrain.h
===================================================================
--- source/graphics/Terrain.h
+++ source/graphics/Terrain.h
@@ -101,6 +101,8 @@
 	// resize this terrain such that each side has given number of patches
 	void Resize(ssize_t size);
 
+	void ChangeHeight(ssize_t x, ssize_t z, u16 height);
+
 	// set up a new heightmap from 16 bit data; assumes heightmap matches current terrain size
 	void SetHeightMap(u16* heightmap);
 	// return a pointer to the heightmap
Index: source/graphics/Terrain.cpp
===================================================================
--- source/graphics/Terrain.cpp
+++ source/graphics/Terrain.cpp
@@ -608,6 +608,19 @@
 	m_HeightMipmap.Initialize(m_MapSize,m_Heightmap);
 }
 
+void CTerrain::ChangeHeight(ssize_t x, ssize_t z, u16 height)
+{
+	x = clamp((ssize_t)floor(x / (int)TERRAIN_TILE_SIZE), (ssize_t)0, m_MapSize-2);
+	z = clamp((ssize_t)floor(z / (int)TERRAIN_TILE_SIZE), (ssize_t)0, m_MapSize-2);
+
+	u16 heightValue = height/HEIGHT_SCALE;
+	// Maybe support for changing verteces height instead of the whole tile would be useful
+	m_Heightmap[z * m_MapSize + x] = heightValue;
+	m_Heightmap[(z+1) * m_MapSize + x] = heightValue;
+	m_Heightmap[z * m_MapSize + (x+1)] = heightValue;
+	m_Heightmap[(z+1) * m_MapSize + (x+1)] = heightValue;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // InitialisePatches: initialise patch data
 void CTerrain::InitialisePatches()
Index: source/simulation2/components/CCmpTerrain.cpp
===================================================================
--- source/simulation2/components/CCmpTerrain.cpp
+++ source/simulation2/components/CCmpTerrain.cpp
@@ -18,6 +18,7 @@
 #include "precompiled.h"
 
 #include "simulation2/system/Component.h"
+#include "simulation2/serialization/SerializeTemplates.h"
 #include "ICmpTerrain.h"
 
 #include "ICmpObstructionManager.h"
@@ -25,6 +26,7 @@
 #include "simulation2/MessageTypes.h"
 
 #include "graphics/Terrain.h"
+#include "graphics/RenderableObject.h"
 #include "renderer/Renderer.h"
 #include "renderer/WaterManager.h"
 #include "maths/Vector3D.h"
@@ -54,13 +56,29 @@
 	{
 	}
 
-	virtual void Serialize(ISerializer& UNUSED(serialize))
+	// serialize only heightmaps for now.
+	virtual void Serialize(ISerializer& serialize)
 	{
+		u16* heightMap = m_Terrain->GetHeightMap();
+		const ssize_t mapSizeSquared = pow(m_Terrain->GetVerticesPerSide(), 2);
+
+		for (ssize_t i = 0; i < mapSizeSquared; ++i)
+			serialize.NumberU16_Unbounded("heightval", heightMap[i]);
 	}
 
-	virtual void Deserialize(const CParamNode& paramNode, IDeserializer& UNUSED(deserialize))
+	virtual void Deserialize(const CParamNode& paramNode, IDeserializer& deserialize)
 	{
 		Init(paramNode);
+
+		const ssize_t mapSizeSquared = pow(m_Terrain->GetVerticesPerSide(), 2);
+		u16* newHeightMap = new u16[mapSizeSquared];
+
+		for (ssize_t i = 0; i < mapSizeSquared; ++i)
+			deserialize.NumberU16_Unbounded("heightval", newHeightMap[i]);
+
+		m_Terrain->SetHeightMap(newHeightMap);
+
+		delete[] newHeightMap;
 	}
 
 	virtual bool IsLoaded() const
@@ -92,6 +110,15 @@
 		return m_Terrain->GetExactGroundLevel(x, z);
 	}
 
+	virtual void ChangeHeight(int x, int z, u16 height)
+	{
+		m_Terrain->ChangeHeight((ssize_t) x, (ssize_t) z, height);
+
+		m_Terrain->MakeDirty(x-1, z-1, x+2, z+2, RENDERDATA_UPDATE_VERTICES);
+
+		MakeDirty(x-1, z-1, x+1, z+1);
+	}
+
 	virtual u16 GetTilesPerSide() const
 	{
 		ssize_t tiles = m_Terrain->GetTilesPerSide();
Index: source/simulation2/components/ICmpTerrain.h
===================================================================
--- source/simulation2/components/ICmpTerrain.h
+++ source/simulation2/components/ICmpTerrain.h
@@ -57,6 +57,8 @@
 	 */
 	virtual u32 GetMapSize() const = 0;
 
+	virtual void ChangeHeight(int x, int z, u16 height) = 0;
+
 	virtual CTerrain* GetCTerrain() = 0;
 
 	/**
Index: source/simulation2/components/ICmpTerrain.cpp
===================================================================
--- source/simulation2/components/ICmpTerrain.cpp
+++ source/simulation2/components/ICmpTerrain.cpp
@@ -22,6 +22,7 @@
 #include "simulation2/system/InterfaceScripted.h"
 
 BEGIN_INTERFACE_WRAPPER(Terrain)
+DEFINE_INTERFACE_METHOD_3("ChangeHeight", void, ICmpTerrain, ChangeHeight, int, int, u16)
 DEFINE_INTERFACE_METHOD_CONST_2("GetGroundLevel", entity_pos_t, ICmpTerrain, GetGroundLevel, entity_pos_t, entity_pos_t)
 DEFINE_INTERFACE_METHOD_CONST_2("CalcNormal", CFixedVector3D, ICmpTerrain, CalcNormal, entity_pos_t, entity_pos_t)
 DEFINE_INTERFACE_METHOD_CONST_0("GetTilesPerSide", u16, ICmpTerrain, GetTilesPerSide)
Index: source/simulation2/system/ComponentTest.h
===================================================================
--- source/simulation2/system/ComponentTest.h
+++ source/simulation2/system/ComponentTest.h
@@ -236,6 +236,10 @@
 		return NULL;
 	}
 
+	virtual void ChangeHeight(int UNUSED(x), int UNUSED(z), u16 UNUSED(height))
+	{
+	}
+
 	virtual void MakeDirty(i32 UNUSED(i0), i32 UNUSED(j0), i32 UNUSED(i1), i32 UNUSED(j1))
 	{
 	}