Overview

The submarine invented by Professor Cuthbert Calculus (Professeur Tournesol) appears in Le Trésor de Rackham le Rouge (Red Rackham’s Treasure) and is one of the most memorable technological creations in The Adventures of Tintin. Shaped like a shark, compact, and deceptively simple in appearance, it embodies a key phase in Hergé’s work: the shift from improvised adventure to plausible, science-driven exploration.

The submarine is not a comic gimmick. It is treated as a serious scientific instrument, integral to the narrative and thematically aligned with restraint, precision, and method.

Design and appearance

Shark form

The submarine’s most striking feature is its shark-like shape, complete with:

• Streamlined body
• Fin-like stabilisers
• A forward “mouth” section serving as the viewing and access point

This biomimetic design is not merely whimsical. It visually communicates:

• Hydrodynamic efficiency
• Quiet movement
• Adaptation to the marine environment

Hergé presents the form as functional rather than decorative, anticipating later twentieth-century interest in bio-inspired engineering.

Scale and capacity

The submarine is small, designed for:

• One or two occupants
• Short-duration underwater missions
• Close inspection rather than long-range travel

Its limited size reinforces the story’s emphasis on targeted exploration, not conquest or domination of the sea. It is a tool for observation and retrieval, not warfare.

Technical characteristics (within the logic of the story)

Mobility and control

The submarine is capable of:

• Precise manoeuvring near the seabed
• Stable hovering above wreckage
• Controlled ascent and descent

It is implied to be electrically powered, silent, and responsive—qualities that distinguish it from earlier, clumsier fictional submersibles.

Visibility

A large viewing window allows direct observation of the underwater environment. This transparency is narratively important: discovery in Tintin is visual and intellectual, not abstract or remote.

Role in the narrative

Locating the wreck of La Licorne

The submarine’s primary function is to enable Tintin and Captain Haddock to:

• Locate the wreck of La Licorne
• Explore the seabed safely
• Recover artefacts linked to Sir Francis Haddock

Without the submarine, the mystery of Red Rackham’s treasure would remain insoluble. The device is therefore not an accessory but a structural necessity.

Discovery rather than appropriation

Significantly, the submarine does not lead directly to the treasure. Instead, it produces:

• Partial answers
• Historical confirmation
• A symbolic clue (the statue of Sir Francis Haddock)

This reinforces a recurring Tintin theme: technology facilitates understanding, not instant reward.

Professor Calculus and scientific ethics

Calculus as inventor

Calculus’s submarine reflects his defining traits:

• Intellectual brilliance
• Practical ingenuity
• Total indifference to prestige or commercial gain

He invents for the sake of possibility, not power. Unlike later inventions (notably the ultrasonic weapon in L’Affaire Tournesol), the submarine is ethically unproblematic—purely exploratory.

Contrast with weaponised science

In the Tintin canon, Calculus’s inventions fall into two categories:

• Tools for discovery (submarine, rocket)
• Technologies vulnerable to abuse (ultrasound device)

The submarine firmly belongs to the first category. It is never contested by villains, stolen by states, or misused. Its moral status is unambiguous.

Visual and symbolic significance

Transition to modernity

The submarine marks a turning point in Tintin:

• From adventure rooted in chance
• To adventure grounded in applied science

It anticipates the much larger scientific leap of Objectif Lune, establishing Calculus as a credible architect of modern exploration.

Harmony with nature

The shark form, silence, and modest scale all suggest coexistence rather than intrusion. The sea is not portrayed as hostile territory to be conquered, but as a space to be entered carefully and temporarily.

Comparison with other Tintin technologies

The submarine stands out as the least morally fraught of Calculus’s creations.

Concluding assessment

The submarine of Professor Tournesol is one of the most quietly significant inventions in The Adventures of Tintin. Modest in scale but precise in function, it represents Hergé’s belief in measured progress, where technology serves understanding rather than domination.

It enables discovery without spectacle, reinforces the intellectual nature of the treasure hunt, and solidifies Calculus’s role as a scientist whose greatest achievements lie not in power, but in opening paths that did not previously exist.