Seaweed Containment Tank (with Lid)

The Seaweed Containment Tank is a glass tank with a metal/reinforced lid (the Seaweed Containment Tank Lid) used in the TARDIS laboratory to securely hold a sentient seaweed specimen from the refinery. The Doctor and Jamie slam the lid shut to trap the organism as its tendrils retract, preventing its escape. The tank is central to the group's investigation of the seaweed's toxicity (emitting North Sea gas that triggers Jamie's sneezes) and supernatural origins. Victoria and Harris observe as the Doctor conducts tests (e.g., Bunsen burner, microscopic examination) to analyze the specimen's biological activity and molecular movement. The tank's dual components (glass container + lid) work together to contain the aggressive organism during critical moments of the narrative.

2 appearances

Purpose

Contain the sentient seaweed specimen and block its escape to prevent spread of toxic gas

Significance

The lid's hasty closure captures the seaweed's calculated retreat, heightening tension by confirming its cunning intelligence and transforming the TARDIS lab from analysis site to frontline against an evolving environmental menace

Appearances in the Narrative

When this object appears and how it's used

2 moments

S5E31 · Fury From The Deep Part 3

Seaweed’s lethal sentience confirmed

The glass tank serves as a controlled environment for the seaweed sample, allowing the Doctor and his companions to observe its reactions to natural gas and the Bunsen burner. It contains the sample physically while also symbolizing the team’s attempt to contain and understand the unknown. The tank’s transparency makes the rusty residue and ‘wriggly things’ visible, turning it into a crucible for the revelation of the weed’s true nature. Its role is both practical and narrative, as the discoveries made through it escalate the stakes of the scene.

Before: Empty and ready for use, placed on the TARDIS lab table alongside the natural gas cylinders and microscope.

After: Holds the now-confirmed toxic and sentient seaweed sample, its contents no longer a mystery but an active threat. The tank remains intact, but its role has shifted from containment to evidence of the danger.

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S5E31 · Fury From The Deep Part 3

Toxic Gas Threat Confirmed in TARDIS Lab

The seaweed containment tank lid is a critical tool for containing the sentient seaweed’s escape. The Doctor and Jamie slam it shut just as the seaweed’s tendrils retract, preventing its release and the spread of toxic gas. The lid’s secure closure underscores the urgency of the situation and the need for immediate action to mitigate the threat.

Before: Open or partially open, allowing the seaweed to push against it and nearly escape the tank.

After: Firmly shut by the Doctor and Jamie, securely containing the seaweed and preventing its escape.

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