Tank 432 (originally Belly of the Bulldog) is a 2015 British psychological horror film written and directed by Nick Gillespie. Gillespie had previously collaborated with Ben Wheatley, who executive produced. Rupert Evans, Deirdre Mullins, Steve Garry, Michael Smiley, April Pearson, and Gordon Kennedy, Tom Meeten, and Alex March star. Evans, Mullins, Garry, Smiley, Kennedy, Meeten portray mercenaries tasked with transporting a hostage (Pearson) and survivor (March) across a battlefield. Along the way, the mercenaries become trapped in an abandoned armoured personnel carrier they enter as refuge against an unseen enemy. (Despite the film's title, the vehicle portrayed is not a tank but a Type 432 armoured personnel carrier, a vehicle used to deploy infantry. The 432 was known in British Army service as the Bulldog, hence the two alternative film titles.) It premiered at the Fantasia International Film Festival.
Plot
In a forest, mercenaries Reeves and Karlsson rejoin the rest of their squad – Gantz, Capper, Evans, commanding officer Smith, along with two hooded and bound captives. Reeves reports fleeing from a group of hostiles, as Karlsson sedates Capper, whose leg is badly wounded. Evans reports a farm and jeep nearby, and Smith orders them to investigate. At the farm, Reeves vomits after seeing a mysterious orange powder. Evans, already nervous, becomes increasingly erratic after finding the jeep's engine has been sabotaged in a gruesome manner. As Karlsson sedates Evans and tends to Capper, Reeves and Gantz explore the farm.
Reeves and Gantz find mercenaries, whom they refer to as "group D", and two other captives, all decapitated, in a barn. As they return, they hear music from a storage container. They find a woman inside, who panics when they turn off the music. Karlsson sedates her and Smith orders her brought along. An enemy flare is shot off, and Smith orders a retreat, leaving Capper behind. Gantz and Evan fire at a hooded figure before retreating, but Evan returns as Capper calls out. The rest flee through a field until they encounter an abandoned armoured personnel carrier. Seeking refuge, they throw out its cargo while Gantz fires at another hooded figure. One of the prisoners stabs Gantz, and Reeves kills her.
Once inside the vehicle, they hear noises from outside as attackers attempt to open the door, which Gantz then jams. Karlsson gives them tranquilizers to help them sleep. Smith orders Gantz to fix the tank. Gantz finds a rotting corpse in the front of the vehicle, but fails to start the engine. He sees another strange figure outside the viewport. Searching the vehicle for tools, they find bottles of orange powder labelled "Kratos". Annabella, the surviving prisoner, claims to be a teacher and explains it means "strength and power" in ancient Greek. She secretly pockets a flare gun from a toolcase.
Reeves dreams of the monster Gantz saw and an argument between Smith and the others about the notebook he constantly writes. He awakens and questions Annabella, who claims to not remember why she is there. The next morning, the argument Reeves dreamt occurs, but Smith refuses to show the notebook. Gantz attempts to repair the engine again, but cannot reach it. He reports an orange powder on the engine, before seeing a monstrous, gasmask-wearing enemy outside the vehicle. After being calmed, he refuses to return, and Karlsson sedates him. Smith orders Reeves to attempt to fix the engine next. Karlsson begins looking through files stored in the vehicle, and finds they are dossiers on the mercenaries and their captives, identifying them as dead, including Smith. Smith expresses disbelief, saying he did not expect that many casualties, but claims he doesn't know anything. Reeves inspects the corpse in the front of the vehicle, and finds that the dog tags are for Evans.
As Reeves attempts to fix the engine, Capper appears and taunts them, refusing to open the hatch. He suggests Smith knows what is going on, and asks Karlsson if she knows with what she has been injecting everyone. As Smith and Karlsson argue, Annabella shoots Smith with the flare gun, killing him. Karlsson kills her, before realizing she was accidentally shot by Smith when he was attacked. Before Karlsson dies, she reads through Smith's mission notes, finding that Smith has been recording the dosages of the red-tinted sedative.