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diff --git a/game/client/hl2/c_npc_hydra.cpp b/game/client/hl2/c_npc_hydra.cpp
new file mode 100644
index 0000000..271c775
--- /dev/null
+++ b/game/client/hl2/c_npc_hydra.cpp
@@ -0,0 +1,386 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "bone_setup.h"
+#include "c_ai_basenpc.h"
+#include "engine/ivdebugoverlay.h"
+#include "tier0/vprof.h"
+#include "soundinfo.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class C_NPC_Hydra : public C_AI_BaseNPC
+{
+public:
+	DECLARE_CLASS( C_NPC_Hydra, C_AI_BaseNPC );
+	DECLARE_CLIENTCLASS();
+	DECLARE_INTERPOLATION();
+
+					C_NPC_Hydra();
+	virtual			~C_NPC_Hydra();
+
+	// model specific
+	virtual	void	OnLatchInterpolatedVariables( int flags );
+	virtual bool	SetupBones( matrix3x4_t *pBoneToWorldOut, int nMaxBones, int boneMask, float currentTime );
+	virtual	void	StandardBlendingRules( Vector pos[], Quaternion q[], float currentTime, int boneMask );
+
+	void			CalcBoneChain( Vector pos[], const Vector chain[] );
+	void			CalcBoneAngles( const Vector pos[], Quaternion q[] );
+
+	virtual bool	GetSoundSpatialization( SpatializationInfo_t& info );
+
+	virtual void	ResetLatched();
+
+#define	CHAIN_LINKS 32
+
+	bool			m_bNewChain;
+	int				m_fLatchFlags;
+	Vector			m_vecChain[CHAIN_LINKS];
+
+	Vector			m_vecHeadDir;
+	CInterpolatedVar< Vector > m_iv_vecHeadDir;
+
+	//Vector			m_vecInterpHeadDir;
+
+	float			m_flRelaxedLength;
+	
+	Vector			*m_vecPos;	// current animation
+	CInterpolatedVar< Vector >	*m_iv_vecPos;
+
+	int				m_numHydraBones;
+	float			*m_boneLength;
+
+	float			m_maxPossibleLength;
+
+private:
+	C_NPC_Hydra( const C_NPC_Hydra & ); // not defined, not accessible
+};
+
+IMPLEMENT_CLIENTCLASS_DT(C_NPC_Hydra, DT_NPC_Hydra, CNPC_Hydra)
+	RecvPropVector	( RECVINFO( m_vecChain[0] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[1] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[2] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[3] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[4] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[5] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[6] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[7] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[8] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[9] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[10] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[11] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[12] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[13] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[14] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[15] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[16] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[17] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[18] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[19] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[20] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[21] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[22] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[23] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[24] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[25] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[26] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[27] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[28] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[29] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[30] ) ),
+	RecvPropVector	( RECVINFO( m_vecChain[31] ) ),
+	RecvPropVector	( RECVINFO( m_vecHeadDir ) ),
+	RecvPropFloat	( RECVINFO( m_flRelaxedLength ) ),
+END_RECV_TABLE()
+
+C_NPC_Hydra::C_NPC_Hydra() : m_iv_vecHeadDir( "C_NPC_Hydra::m_iv_vecHeadDir" )
+{
+	AddVar( &m_vecHeadDir, &m_iv_vecHeadDir, LATCH_ANIMATION_VAR );
+
+	m_numHydraBones = 0;
+	m_boneLength = NULL;
+	m_maxPossibleLength = 1;
+	m_vecPos = NULL;
+	m_iv_vecPos = NULL;
+}
+
+
+C_NPC_Hydra::~C_NPC_Hydra()
+{
+	delete m_boneLength;
+	delete m_vecPos;
+	delete[] m_iv_vecPos;
+	m_iv_vecPos = NULL;
+}
+
+void C_NPC_Hydra::OnLatchInterpolatedVariables( int flags )
+{
+	m_bNewChain = true;
+	m_fLatchFlags = flags;
+
+	BaseClass::OnLatchInterpolatedVariables( flags );
+}
+
+void C_NPC_Hydra::ResetLatched()
+{
+	for (int i = 0; i < m_numHydraBones; i++)
+	{
+		m_iv_vecPos[i].Reset();
+	}
+
+	BaseClass::ResetLatched();
+}
+
+bool C_NPC_Hydra::SetupBones( matrix3x4_t *pBoneToWorldOut, int nMaxBones, int boneMask, float currentTime )
+{
+	return BaseClass::SetupBones( pBoneToWorldOut, nMaxBones, boneMask, currentTime );
+}
+
+
+void  C_NPC_Hydra::StandardBlendingRules( Vector pos[], Quaternion q[], float currentTime, int boneMask )
+{
+	VPROF( "C_NPC_Hydra::StandardBlendingRules" );
+
+	studiohdr_t *hdr = GetModelPtr();
+	if ( !hdr )
+	{
+		return;
+	}
+
+	int i;
+
+	// check for changing model memory requirements
+	bool bNewlyInited = false;
+	if (m_numHydraBones != hdr->numbones)
+	{
+		m_numHydraBones = hdr->numbones;
+
+		// build root animation
+		float	poseparam[MAXSTUDIOPOSEPARAM];
+		for (i = 0; i < hdr->GetNumPoseParameters(); i++)
+		{
+			poseparam[i] = 0;
+		}
+		CalcPose( hdr, NULL, pos, q, 0.0f, 0.0f, poseparam, BONE_USED_BY_ANYTHING );
+
+		// allocate arrays
+		if (m_boneLength)
+		{
+			delete[] m_boneLength;
+		}
+		m_boneLength = new float [m_numHydraBones];
+
+		if (m_vecPos)
+		{
+			delete[] m_vecPos;
+		}
+		m_vecPos = new Vector [m_numHydraBones];
+		
+		if (m_iv_vecPos)
+		{
+			delete m_iv_vecPos;
+		}
+		m_iv_vecPos = new CInterpolatedVar< Vector >[m_numHydraBones];
+		for ( i = 0; i < m_numHydraBones; i++ )
+		{
+			m_iv_vecPos[ i ].Setup( &m_vecPos[ i ], LATCH_SIMULATION_VAR | EXCLUDE_AUTO_LATCH | EXCLUDE_AUTO_INTERPOLATE );
+		}
+
+		// calc models bone lengths
+		m_maxPossibleLength = 0;
+		for (i = 0; i < m_numHydraBones-1; i++)
+		{
+			m_boneLength[i] = (pos[i+1] - pos[i]).Length();
+			m_maxPossibleLength += m_boneLength[i];
+		}
+		m_boneLength[i] = 0.0f;
+
+		bNewlyInited = true;
+	}
+
+	// calc new bone setup if networked.
+	if (m_bNewChain)
+	{
+		CalcBoneChain( m_vecPos, m_vecChain );
+		for (i = 0; i < m_numHydraBones; i++)
+		{
+		//	debugoverlay->AddLineOverlay( m_vecPos[i], m_vecPos[i<m_numHydraBones-1?i+1:m_numHydraBones-1], 0, 255, 0, false, 0.1 );
+			m_vecPos[i] = m_vecPos[i] - GetAbsOrigin();
+
+			if ( m_fLatchFlags & LATCH_SIMULATION_VAR )
+			{
+				m_iv_vecPos[i].NoteChanged( currentTime, true );
+			}
+		}
+		m_bNewChain = false;
+	}
+
+	// if just allocated, initialize bones
+	if (bNewlyInited)
+	{
+
+		for (i = 0; i < m_numHydraBones; i++)
+		{
+			m_iv_vecPos[i].Reset();
+		}
+	}
+
+	for (i = 0; i < m_numHydraBones; i++)
+	{
+		m_iv_vecPos[i].Interpolate( currentTime );
+		pos[ i ] = m_vecPos[ i ]; 
+	}
+
+	// calculate bone angles
+	CalcBoneAngles( pos, q );
+
+	// rotate the last bone of the hydra 90 degrees since it's oriented differently than the others
+	Quaternion qTmp;
+	AngleQuaternion( QAngle( 0, -90, 0) , qTmp );
+	QuaternionMult( q[m_numHydraBones - 1], qTmp, q[m_numHydraBones - 1] );
+}
+
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Fits skeleton of hydra to the variable segment length "chain" array
+//			Adjusts overall hydra so that "m_flRelaxedLength" of texture fits over 
+//			the actual length of the chain
+//-----------------------------------------------------------------------------
+
+void  C_NPC_Hydra::CalcBoneChain( Vector pos[], const Vector chain[] )
+{
+	int i, j;
+
+	// Find the dist chain link that's not zero length
+	i = CHAIN_LINKS-1;
+	while (i > 0)
+	{
+		if ((chain[i] - chain[i-1]).LengthSqr() > 0.0)
+		{
+			break;
+		}
+		i--;
+	}
+
+	// initialize the last bone to the last bone
+	j = m_numHydraBones - 1;
+
+	// clamp length
+	float totalLength = 0;
+	for (int k = i; k > 0; k--)
+	{
+		// debugoverlay->AddLineOverlay( chain[k], chain[k-1], 255, 255, 255, false, 0 );
+		totalLength += (chain[k] - chain[k-1]).Length();
+	}
+	totalLength = clamp( totalLength, 1.0, m_maxPossibleLength );
+	float scale = m_flRelaxedLength / totalLength;
+
+	// starting from the head, fit the hydra skeleton onto the chain spline
+	float dist = -16;
+	while (j >= 0 && i > 0)
+	{
+		// debugoverlay->AddLineOverlay( chain[i], chain[i-1], 255, 255, 255, false, 0 );
+		float dt = (chain[i] - chain[i-1]).Length() * scale;
+		float dx = dt;
+		while (j >= 0 && dist + dt >= m_boneLength[j])
+		{
+			float s = (dx - (dt - (m_boneLength[j] - dist))) / dx;
+
+			if (s < 0 || s > 1.)
+				s = 0;
+			// pos[j] = chain[i] * (1 - s) + chain[i-1] * s;
+			Catmull_Rom_Spline( chain[(i<CHAIN_LINKS-1)?i+1:CHAIN_LINKS-1], chain[i], chain[(i>0)?i-1:0], chain[(i>1)?i-2:0], s, pos[j] );
+			// debugoverlay->AddLineOverlay( pos[j], chain[i], 0, 255, 0, false, 0 );
+			// debugoverlay->AddLineOverlay( pos[j], chain[i-1], 0, 255, 0, false, 0 );
+
+			dt = dt - (m_boneLength[j] - dist);
+			j--;
+			dist = 0;
+		}
+		dist += dt;
+		i--;
+	}
+
+	while (j >= 0)
+	{
+		pos[j] = chain[0];
+		j--;
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Minimize the amount of twist between bone segments
+//-----------------------------------------------------------------------------
+
+void C_NPC_Hydra::CalcBoneAngles( const Vector pos[], Quaternion q[] )
+{
+	int i;
+	matrix3x4_t bonematrix;
+
+	for (i = m_numHydraBones - 1; i >= 0; i--)
+	{
+		Vector forward;
+		Vector left2;
+
+		if (i != m_numHydraBones - 1)
+		{
+			QuaternionMatrix( q[i+1], bonematrix );
+			MatrixGetColumn( bonematrix, 1, left2 );
+
+			forward = (pos[i+1] - pos[i]) /* + (pos[i] - pos[i-1])*/;
+			float length = VectorNormalize( forward );
+			if (length == 0.0)
+			{
+				q[i] = q[i+1];
+				continue;
+			}
+		}
+		else
+		{
+			forward = m_vecHeadDir;
+			VectorNormalize( forward );
+
+			VectorMatrix( forward, bonematrix );
+			MatrixGetColumn( bonematrix, 1, left2 );
+		}
+
+		Vector up = CrossProduct( forward, left2 );
+		VectorNormalize( up );
+
+		Vector left = CrossProduct( up, forward );
+
+		MatrixSetColumn( forward, 0, bonematrix );
+		MatrixSetColumn( left, 1, bonematrix );
+		MatrixSetColumn( up, 2, bonematrix );
+
+		// MatrixQuaternion( bonematrix, q[i] );
+		QAngle angles;
+		MatrixAngles( bonematrix, angles );
+		AngleQuaternion( angles, q[i] );
+	}
+}
+
+bool C_NPC_Hydra::GetSoundSpatialization( SpatializationInfo_t& info )
+{
+	bool bret = BaseClass::GetSoundSpatialization( info );
+	// Default things it's audible, put it at a better spot?
+	if ( bret )
+	{
+		// TODO:  Note, this is where you could override the sound position and orientation and use
+		//  an attachment points position as the sound source
+		// You might have to issue C_BaseAnimating::AllowBoneAccess( true, false ); to allow
+		//  bone setup during sound spatialization if you run into asserts...
+	}
+
+	return bret;
+}
+