Tentacle

"Hey! Hey, over here! Eat lead, you outer space octopus!"

- Security guard

Hypersuctor sensitiva, commonly known as the Tentacle, is a large alien creature which responds violently to sound and vibrations. It is first seen in a rocket propulsion test chamber, but is also seen through the series on Xen and in other areas of the Black Mesa Research Facility.

Overview


A large, green, segmented stalk supports a "head", which ends in a sharply pointed, blade-like appendage and features what looks like an eye. This "eye" appears to be a sensory organ, although the creature only reacts to sound and surface vibrations. Tentacles usually emanate from pits, into which they can retract when injured or in danger. http://half-life.wikia.com/wiki/Special:RecentChangeses present may reflect the size or stage of development of the base, or else a more spread-out being, with Tentacles in various locales. Reasons that could support this assumption are how the Scientist pulled from the control room, when first encountered in the silo, is pulled down into the pit and possibly eaten by the base. Another characteristic could be how it relies on hearing, as the base could be too large to fit through, and relies on keen hearing to pull prey down.

Appearances
Throughout the Half-Life series, only ten Tentacles have been encountered, of which eight are found in Half-Life while the other two are found in the expansion game Opposing Force.

Half-Life
In Half-Life, the first encounter is in the chapter Blast Pit where the player encounters three tentacles in a Rocket Propulsion Silo of Sector D. These tentacles act as a sort of mini-boss. As Gordon's weapons do no damage, he has to risk himself through the Tentacle-filled Silo. As the tentacles rely on sound and vibration to locate their prey, Gordon can toss grenades to distract them temporarily. Gordon moves through the silo and reaches other areas that branch off the silo, so that he can switch on the Oxygen, Fuel and Power for the Rocket Engine. After that, he again must risk through the same Silo back to the Control Room and Activate the Rocket Engine's test fire. The intense heat of the engine kills the Tentacles and the player progresses further.

A Tentacle is later encountered in the chapter Surface Tension. It is found living in a small sandy area in the canyon, emerged from a burrow under the sand. Health, ammo and other supplies closely surround its base, and Gordon must sneak up to a dangerous proximity of the Tentacle if the player chooses to retrieve them.

Later, a Tentacle is found in the chapter Interloper, after the first teleportatihttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangesfe: Opposing Force storyline#Vicarious Reality|Vicarious Reality]]'' where the player finds them in an Unconstructed Observation Area. The player has to distract them to pass through.

Behavior and skills
In terms of behavior, Tentacles aggressively target prey in the immediate vicinity of their pits. While searching for prey, they gently tap the surrounding area, but when even the quietest noise or vibration is detected, the Tentacles will furiously and repeatedly strike at the location where noise or vibration was detected. When a Tentacle comes in contact with prey, it will attempt to pull it into the pit, presumably where it is consumed and digested. In the game, this behavior is witnessed firsthand by the player when a scientist is grabbed and taken, screaming, into the pit at the base of the Tentacles.

In the game, Tentacles cannot be destroyed with the player's arsenal, but shooting the stalk a few times will temporarily drive the creature into its burrow. Great care must be taken when moving near them, forcing the player either to silently crouch past the burrow or cause a distraction with explosives (preferably hand grenades, as those don't reveal the player's location with sound), allowing the player to sprint out of range. It is a good idea to use this tactic, as tentacles can kill the player with a single strike.

Behind the scenes

 * Chuck Jones designed the Tentacle and the Silo D scene where the creature grabs the scientist and hauls him screaming from Silo D-01's control room. According to John Guthrie, no one at Valve was prepared for anything like this scene. When they saw the effect it had on gamers in sneak previews, they knew they had made the right decision to put animated sequences directly into the game rather than setting them apart in cut scenes.

Trivia

 * The code of the Tentacle's base is called "cycler", which is used to spawn props in GoldSrc.


 * The tentacles of the Gene Worm are similar to the Xen Tentacle.


 * It is unknown whether the tentacles are all singleminded organisms bound to the base or if they are simply appendages controlled by the base. It remains one of the games most questioned mysteries.


 * The tentacle's stalk does not have its own 3D model, instead using a texture which moves with the player. This means that the texture rotates as the player moves so the player always views the same angle. This was a fairly common technique in games of that era, and because the tentacle stalk is constantly moving, it would have been very difficult to include a full 3D animation for it.

Audio
Tentacle moan Ditto Death

Gallery
 File:Tentacle concept.jpg|Concept art of the early tentacle. File:Tentacle silo concept.jpg|Concept art for the Half-Life chapter Blast Pit. File:Gordon tentacles.jpg|Gordon Freeman wielding his crowbar in front of the Blast Pit Tentacles, while two security guards fall to their deaths in the background. File:Tentacle render.jpg|Old high-res model render. File:Bigtent.jpg|The early Barney in the Tentacle pit. File:Bigtent2.jpg|Ditto, another version. File:Bigtent3.jpg| File:Bigtent4.jpg| File:Bigtent5.jpg| File:Bigtent6.jpg| File:C1a4b_-1.png|Tentacle grabing scientist File:C1a4i0001.jpg|Tentacle taking away a scientist in Silo D. File:Barney Tentacles pwnd.jpg|Security guard about to get killed by the Tentacles in Silo D. File:C1a4i0018Resized.png|Tentacle attacking Gordon. File:C1a4g0001.jpg|The base of Silo D's Tentacle, underwater. File:Tentacle Xen1.jpg|The first Tentacle seen on Xen. File:Overhaul_tentacle.jpg|Gordon attacking the Tentacle with the Hivehand File:Tentacle Xen2.jpg|Tentacles on Xen. File:Tentacle base model.jpg|Base model.

==List ohttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangeshttp://half-life.wikia.com/wiki/Special:RecentChangesf appearances==
 * Half-Life
 * Half-Life: Opposing Force