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diff --git a/game/server/hl2/npc_basescanner.h b/game/server/hl2/npc_basescanner.h
new file mode 100644
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+++ b/game/server/hl2/npc_basescanner.h
@@ -0,0 +1,256 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef NPC_BASESCANNER_H
+#define NPC_BASESCANNER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "cbase.h"
+#include "player_pickup.h"
+#include "weapon_physcannon.h"
+#include "hl2_player.h"
+#include "smoke_trail.h"
+#include "ai_basenpc_physicsflyer.h"
+
+//-----------------------------------------------------------------------------
+// States for the scanner's sound.
+//-----------------------------------------------------------------------------
+enum ScannerFlyMode_t
+{
+	SCANNER_FLY_PHOTO = 0,		// Fly close to photograph entity
+	SCANNER_FLY_PATROL,			// Fly slowly around the enviroment
+	SCANNER_FLY_FAST,			// Fly quickly around the enviroment
+	SCANNER_FLY_CHASE,			// Fly quickly around the enviroment
+	SCANNER_FLY_SPOT,			// Fly above enity in spotlight position
+	SCANNER_FLY_ATTACK,			// Get in my enemies face for spray or flash
+	SCANNER_FLY_DIVE,			// Divebomb - only done when dead
+	SCANNER_FLY_FOLLOW,			// Following a target
+};
+
+enum ScannerInspectAct_t
+{
+	SCANNER_INSACT_HANDS_UP,
+	SCANNER_INSACT_SHOWARMBAND,
+};
+
+// Sentences
+#define SCANNER_SENTENCE_ATTENTION	0
+#define SCANNER_SENTENCE_HANDSUP	1
+#define SCANNER_SENTENCE_PROCEED	2
+#define SCANNER_SENTENCE_CURIOUS	3
+
+// Scanner attack distances
+#define SCANNER_ATTACK_NEAR_DIST		150		// Fly attack min distance
+#define SCANNER_ATTACK_FAR_DIST			300		// Fly attack max distance
+#define SCANNER_ATTACK_RANGE			350		// Attack max distance
+#define	SCANNER_ATTACK_MIN_DELAY		8		// Min time between attacks
+#define	SCANNER_ATTACK_MAX_DELAY		12		// Max time between attacks
+#define	SCANNER_EVADE_TIME				1		// How long to evade after take damage
+
+// Scanner movement vars
+#define	SCANNER_BANK_RATE				30
+#define	SCANNER_MAX_SPEED				250
+#define	SCANNER_MAX_DIVE_BOMB_SPEED		2500
+#define SCANNER_SQUAD_FLY_DIST			500		// How far to scanners stay apart
+#define SCANNER_SQUAD_HELP_DIST			4000	// How far will I fly to help
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+class CNPC_BaseScanner : public CAI_BasePhysicsFlyingBot, public CDefaultPlayerPickupVPhysics
+{
+	DECLARE_CLASS( CNPC_BaseScanner, CAI_BasePhysicsFlyingBot );
+
+public:
+	CNPC_BaseScanner();
+
+	void			Spawn(void);
+
+	virtual void	UpdateEfficiency( bool bInPVS );
+
+	Class_T			Classify( void ) { return(CLASS_SCANNER); }
+	virtual float	GetAutoAimRadius();
+
+	void			Event_Killed( const CTakeDamageInfo &info );
+	int				OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	int				OnTakeDamage_Dying( const CTakeDamageInfo &info );
+	void			TraceAttack( const CTakeDamageInfo &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator );
+	void			Gib(void);
+
+	void			OnStateChange( NPC_STATE eOldState, NPC_STATE eNewState );
+	void			ClampMotorForces( Vector &linear, AngularImpulse &angular );
+
+	int				DrawDebugTextOverlays(void);
+
+	virtual float	GetHeadTurnRate( void );
+
+	virtual void	VPhysicsCollision( int index, gamevcollisionevent_t *pEvent );
+
+	// 	CDefaultPlayerPickupVPhysics
+	void			OnPhysGunPickup( CBasePlayer *pPhysGunUser, PhysGunPickup_t reason );
+	void			OnPhysGunDrop( CBasePlayer *pPhysGunUser, PhysGunDrop_t Reason );
+
+	bool			ShouldPlayIdleSound( void );
+	void			IdleSound( void );
+	void			DeathSound( const CTakeDamageInfo &info );
+	void			AlertSound( void );
+	void			PainSound( const CTakeDamageInfo &info );
+	virtual char	*GetScannerSoundPrefix( void ) { return ""; }
+	void			ScannerEmitSound( const char *pszSoundName );
+
+	int				MeleeAttack1Conditions ( float flDot, float flDist );
+
+	int				SelectSchedule(void);
+	void			StartTask( const Task_t *pTask );
+	void			OnScheduleChange( void );
+	void			UpdateOnRemove( void );
+	virtual float	GetMaxSpeed( void );
+
+	void			PostRunStopMoving()	{} // scanner can use "movement" activities but not be moving
+
+	virtual bool	CanBecomeServerRagdoll( void ) { return false;	}
+
+	void			SpeakSentence( int sentenceType );
+
+	bool			IsHeldByPhyscannon( void );
+
+	// Inputs
+	void			InputSetFlightSpeed( inputdata_t &inputdata );
+	void			InputSetDistanceOverride( inputdata_t &inputdata );
+
+protected:
+	virtual char		*GetEngineSound( void ) { return NULL; }
+	void				PlayFlySound(void);
+
+	void				SetBanking( float flInterval );
+	void				UpdateHead( float flInterval );
+	inline CBaseEntity *EntityToWatch( void );
+
+	bool				IsEnemyPlayerInSuit( void );
+
+	// Movement
+	virtual bool		OverridePathMove( CBaseEntity *pMoveTarget, float flInterval );
+	virtual bool		OverrideMove( float flInterval );
+	Vector				IdealGoalForMovement( const Vector &goalPos, const Vector &startPos, float idealRange, float idealHeight );
+	virtual void		AdjustScannerVelocity( void ) { return; }
+	virtual void		MoveToAttack(float flInterval);
+	virtual void		MoveToTarget( float flInterval, const Vector &vecMoveTarget );
+	virtual void		MoveExecute_Alive(float flInterval);
+	virtual float		MinGroundDist(void) { return 64; }
+	Vector				VelocityToEvade(CBaseCombatCharacter *pEnemy);
+	virtual float		GetGoalDistance( void );
+
+	// Divebombing
+	virtual void		AttackDivebomb( void );
+	void				DiveBombSoundThink();
+	void				AttackDivebombCollide(float flInterval);
+	void				MoveToDivebomb(float flInterval);
+	void				BlendPhyscannonLaunchSpeed();
+
+private:
+	bool	GetGoalDirection( Vector *vOut );
+
+	void	StartSmokeTrail( void );
+
+	// Take damage from being thrown by a physcannon 
+	void TakeDamageFromPhyscannon( CBasePlayer *pPlayer );
+
+	// Take damage from physics impacts
+	void TakeDamageFromPhysicsImpact( int index, gamevcollisionevent_t *pEvent );
+
+	// Do we have a physics attacker?
+	CBasePlayer *HasPhysicsAttacker( float dt );
+
+	virtual void		StopLoopingSounds(void);
+
+public:
+	// ------------------------
+	//  Death Cleanup
+	// ------------------------
+	CTakeDamageInfo		m_KilledInfo;
+
+protected:
+	ScannerFlyMode_t	m_nFlyMode;
+
+	// Pose parameters
+	int					m_nPoseTail;
+	int					m_nPoseDynamo;
+	int					m_nPoseFlare;
+	int					m_nPoseFaceVert;
+	int					m_nPoseFaceHoriz;
+
+	bool				m_bHasSpoken;
+
+	// Movement
+	float				m_flFlyNoiseBase;
+	float				m_flEngineStallTime;
+	float				m_fNextFlySoundTime;
+	Vector				m_vecDiveBombDirection;		// The direction we dive bomb. Calculated at the moment of death.
+	float				m_flDiveBombRollForce;		// Used for roll while dive bombing.
+
+	float				m_flGoalOverrideDistance;
+
+	// Deriver scanner variables
+	float				m_flAttackNearDist;
+	float				m_flAttackFarDist;
+	float				m_flAttackRange;
+
+private:
+	CSoundPatch			*m_pEngineSound;
+
+	// physics influence
+	CHandle<CBasePlayer>	m_hPhysicsAttacker;
+	float					m_flLastPhysicsInfluenceTime;
+
+	// Attacks
+	SmokeTrail			*m_pSmokeTrail;
+
+protected:
+	DEFINE_CUSTOM_AI;
+
+	// Custom interrupt conditions
+	enum
+	{
+		COND_SCANNER_FLY_CLEAR = BaseClass::NEXT_CONDITION,
+		COND_SCANNER_FLY_BLOCKED,							
+		COND_SCANNER_GRABBED_BY_PHYSCANNON,
+		COND_SCANNER_RELEASED_FROM_PHYSCANNON,
+
+		NEXT_CONDITION,
+	};
+
+	// Custom schedules
+	enum
+	{
+		SCHED_SCANNER_PATROL = BaseClass::NEXT_SCHEDULE,
+		SCHED_SCANNER_ATTACK,
+		SCHED_SCANNER_ATTACK_HOVER,
+		SCHED_SCANNER_ATTACK_DIVEBOMB,
+		SCHED_SCANNER_CHASE_ENEMY,
+		SCHED_SCANNER_CHASE_TARGET,
+		SCHED_SCANNER_FOLLOW_HOVER,
+		SCHED_SCANNER_HELD_BY_PHYSCANNON,
+
+		NEXT_SCHEDULE,
+	};
+
+	// Custom tasks
+	enum
+	{
+		TASK_SCANNER_SET_FLY_PATROL = BaseClass::NEXT_TASK,
+		TASK_SCANNER_SET_FLY_CHASE,
+		TASK_SCANNER_SET_FLY_ATTACK,
+		TASK_SCANNER_SET_FLY_DIVE,
+
+		NEXT_TASK,
+	};
+
+	DECLARE_DATADESC();
+};
+
+#endif // NPC_BASESCANNER_H