Fabula
Object
Object

Transom Door Fasteners (Blind-Headed)

Bronze blind-headed rivets that secure transom doors' inner hulls across Ark stations. Their countersunk heads are flush with metal plates to prevent tampering from outside. Full removal requires specialized tools or sonic technology, as seen when rivets securing the aft transom shutter and sickbay transom door were extracted from the blind sides, leaving clean cylindrical sockets. This tamper-evident design makes unauthorized removal through physical force impossible, underscoring the advanced nature of the sabotage operations.
3 appearances

Purpose

To permanently secure metal hull panels from the interior against external disassembly or sabotage, acting as structural rivets that blend with the surface to avoid tampering.

Significance

Key physical evidence proving a deliberate infiltration plot aboard the station. The rivets’ removal uncovers a concealed pathway for Cybermen or human agents to bypass normally secure barriers. Stevenson's realization shifts the investigation from plague containment to infiltration, forcing an immediate station-wide lockdown that escalates internal tensions between scientific oversight and covert military operations.

Appearances in the Narrative

When this object appears and how it's used

3 moments
S12E17 · Revenge of the Cybermen Part 1
Door traps Doctor but Sarah saves him

The lock on the transom door forms the immediate interface between the Doctor’s manipulation and the door’s release trigger. Once unlatchable from the outside, the door’s lethal mechanism responds immediately when he touches the internal component, exposing a deliberate and dangerous sabotage intended to maim or kill intruders.

Before: Locked and inoperable from outside but retaining the Doctor’s grip through the hinge gap
After: Manipulated into a neutral position by the Doctor’s touch before the door’s sudden lurch forced Sarah’s reopening
View full event
S12E17 · Revenge of the Cybermen Part 1
Tampered door confirms intruder plot

The bronze blind-headed rivets, designed to be tamper-proof from the outer hull side, are found forcibly extracted from the inner frame. Their precise removal with blunt force or sonic application exposes a security failure and reveals the breach point. The rivets, previously flush and seamless, now show clean shank ends and cylindrical sockets, betraying manual extraction.

Before: Securely fastened with flush heads on the transom door frame, one of the few guaranteed-safe entry points on the station
After: Completely removed from the inside, leaving clean tool marks and undermining the door’s structural integrity
View full event
S12E17 · Revenge of the Cybermen Part 1
Stevenson launches a stationwide search

During this critical investigation, the aft transom's bronze blind-headed rivets are discovered forcefully extracted from the inside hull using precision tools. Their normally tamper-proof design is systematically breached, revealing the security feature as a fatal vulnerability when subjected to sonic technology.

Before: Secure rivets maintaining transom shutter integrity preventing unauthorized access from either side of the door frame
After: Compromised rivets with clean extraction sockets indicating deliberate sabotage from inside the transom compartment
View full event