In early 2000, Lee Wenham, a seasoned criminal from South-East London, begins planning an audacious heist targeting the Millennium Dome's De Beers diamond exhibition, which houses a rare collection of diamonds valued at approximately £350 million. Lee assembles a team of specialists, each with unique skills necessary for the operation, including a driver, a bulldozer operator, and lookouts. The plan is to execute a ram-raid using a bulldozer to break into the Dome in broad daylight, seize the diamonds, and escape via speedboat on the River Thames.

As the team prepares, the police Flying Squad, led by Jon Shatford, become aware of suspicious activities and start surveillance on the group. The police connect the gang to previous crimes and grow increasingly convinced that a major heist is imminent. Despite this, the criminals proceed with their preparations, unaware of the full extent of the police monitoring.

On November 7, 2000, the gang initiates the heist. They drive a bulldozer to the Millennium Dome and ram it to gain entry. The sequence unfolds with the bulldozer smashing through the Dome's security barriers, triggering alarms. Inside, the team quickly locates the diamond exhibit. They hastily load the diamonds into bags while coordinating their escape plan.

Meanwhile, the Flying Squad intensifies their response. Officers move to intercept the robbers, setting up roadblocks and preparing to pursue them along the Thames. The gang exits the Dome and rushes to their waiting speedboat on the riverbank. A tense chase ensues as the police attempt to stop the boat from fleeing.

During the escape, the criminals face obstacles including police boats and roadblocks. The gang maneuvers the speedboat skillfully, navigating the Thames to evade capture. However, the police manage to corner them downstream. A confrontation occurs where the robbers are forced to abandon the boat and flee on foot.

The police quickly apprehend several members of the gang during the foot chase. Lee Wenham and a few others manage to evade immediate capture but are pursued relentlessly. Over the following days, the police conduct raids and arrests, gradually dismantling the gang.

Throughout the series, the narrative alternates between the robbers' perspectives, focusing on their motivations and planning, and the police's efforts to thwart the heist and bring the criminals to justice. The story reveals the meticulous planning, the tension of the heist execution, and the eventual downfall of the gang due to police surveillance and intervention.

The diamonds themselves are never fully recovered, adding a layer of mystery to the aftermath. The series ends with reflections on the audacity of the crime, the failures and successes of both sides, and the lasting impact on those involved.

The ending of The Diamond Heist shows the audacious plan ultimately failing as the police, who had been surveilling the gang, intervene just in time to thwart the robbery. The criminals are unable to execute their escape by speedboat on the Thames, and the heist collapses under law enforcement pressure.

Expanding on the ending scene by scene:

The final part of the series builds towards the climax with Lee Wenham and his crew preparing to ram-raid the Millennium Dome. They enter the exhibition area with a precise plan to break the thick glass chambers securing the diamonds. Lee had devised a method using a Hilti nail gun to weaken the glass followed by smashing it with sledgehammers.

As the three men begin breaking open the cases to seize the precious diamonds, including the centerpiece Millennium Stone, tension rises. The operation was designed to be carried out quickly within minutes before fleeing on a speedboat arranged on the Thames--a route they had successfully used twice before to evade police.

However, unknown to them, the police had been closely surveilling their every move. Just as they attempt to flee, law enforcement closes in, preventing the men from reaching their getaway boat. The chase intensifies with officers intercepting them near the river. The plan unravels rapidly as police detain the criminals, ending their hopes of escaping with the priceless gems.

The series concludes with reflections on the boldness of the plan and the careful police work that foiled it. Lee had even planned to retire in Spain with the loot, but that future evaporates as the arrest brings the criminal saga to a close.

This ending scene highlights the confrontation between meticulous criminal planning and determined police surveillance, underscoring the clash of wills that defined this infamous heist attempt.

The main characters in the heist gang have distinct roles: Lee Wenham is the main perpetrator; Ray Betson is the charismatic criminal mastermind planning the heist; Bob Adams is the handyman with safe-breaking experience; Bill Cockram provides muscle as a hot-headed goon; Aldo Ciarrocchi handles technical aspects despite little criminal experience; and Terry Millman is a notorious violent robber brought in for the operation.

The police, specifically the elite Flying Squad of the Metropolitan Police, are surveilling the gang as they plan the audacious heist. They connect the gang to previous crimes and prepare to intervene, creating a tense cat-and-mouse dynamic as the heist day approaches.

The Millennium Dome in South East London is the location targeted for the heist. It houses the precious Millennium Star diamond, valued at £350 million, which the gang plans to steal by ram-raiding the Dome in broad daylight and escaping by speedboat on the Thames.

The series narrates the heist from multiple perspectives, including those of the gangsters involved, the pursuing police force, and a journalist. This multi-angle storytelling highlights the motivations and consequences for each side, especially focusing on the robber's desire for money and status despite personal costs.

The gang faces several challenges: coordinating a complex plan involving a ram-raid and escape by boat; overcoming police surveillance by the Flying Squad; managing internal team dynamics with members of varying experience and temperaments; and breaking into a highly secure safe containing the diamonds.

The 2025 TV docu-series The Diamond Heist is a true-crime documentary exploring the 2000 attempted theft of an extremely valuable diamond from London's Millennium Dome. It features interviews with criminals involved and police, detailing an audacious, high-stakes heist plan.

Regarding family-friendliness:

• As a true-crime docuseries, it contains themes of crime, criminal activity, and law enforcement intervention, which could be sensitive or unsettling for children or particularly sensitive viewers.
• The series likely includes descriptions or reenactments of a violent or forceful break-in (ram-raid of a building) and possibly tense moments involving police surveillance and confrontation.
• Although not a fictional drama, such true-crime content frequently includes mention or depiction of criminal behavior, potentially some mild violence or aggressive acts, which might not be suitable for younger audiences.
• There is no indication of extreme graphic violence, explicit language, or adult content of a sexual nature from the available information, but the criminal themes and depiction of a major heist may still be considered intense for children.

Therefore, The Diamond Heist is not classified as family-friendly and is best suited for mature audiences interested in crime documentaries. Parents should exercise discretion if considering it for children or sensitive viewers, especially given the focus on criminal activity and tension during the heist without any plot spoilers disclosed here.

There is no information in the available search results about any dog dying in the TV series "The Diamond Heist" produced in 2025. The show focuses on a group of London criminals planning to rob the Millennium Dome, with no mention of a dog being involved in the plot.