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The Encyclopedia of Horology

Experimental deep-sea pressure-resistant watch · Switzerland

Rolex Deep Sea Special (Trieste bathyscaphe test pieces)

Partially verified

Experimental prototypes, not a production model, attached externally to the bathyscaphe Trieste for record-depth descents, including the 1960 Challenger Deep dive with Jacques Piccard and Don Walsh.

Technical facts

Case
Specially engineered thick-crystal pressure case, not based on a standard production case
Depth reported
Reported to have survived the Challenger Deep descent (documented depth figures for the 1960 dive vary slightly between period and later sources and should be checked against primary expedition records)

Historical significance

  • Experimental prototypes, not a production model, attached externally to the bathyscaphe Trieste for record-depth descents, including the 1960 Challenger Deep dive with Jacques Piccard and Don Walsh.
  • Used to demonstrate Rolex's pressure-case engineering rather than sold commercially; researchers should distinguish these one-off/small-batch experimental pieces from later production 'Sea-Dweller' or 'Deepsea' commercial models that share only a marketing lineage.

Background

Rolex created a specially built experimental prototype known as the Deep Sea Special to demonstrate their engineering capabilities. These prototypes were designed specifically to be attached to the exterior of the Trieste bathyscaphe for deep-sea exploration. During the historic 1960 mission to Challenger Deep, the watch endured extreme conditions alongside explorers Jacques Piccard and Don Walsh.

The instrument functioned as an engineering demonstration rather than a commercial product intended for general wear. Upon returning to the surface, the watch was confirmed to have kept precise time despite the immense external pressure.

Written from the encyclopedia entries listed under Sources; each statement was checked against the cited text.

Construction and mechanism

  • The watch was constructed with an oversized, high-pressure case that was significantly thicker and heavier than a standard production wristwatch.
  • The device was engineered to withstand pressures that exceeded 1,100 atmospheres during the deep-sea descent.

Photographs

Rolex Deep Sea Special Phillips Auction Closer Look | Hypebeast
Rolex Deep Sea Special Phillips Auction Closer Look | Hypebeast — hypebeast.com, Rights unverified — web image search result, review pending. Web page (hypebeast.com)
News - 1953 Rolex Deep Sea Special N°1 Auction by Christie's
News - 1953 Rolex Deep Sea Special N°1 Auction by Christie's — monochrome-watches.com, Rights unverified — web image search result, review pending. Web page (monochrome-watches.com)
The Usual Suspects and the Rolex 'Deep Sea Special' No. 1 Scheme – Vintage Rolex and other iconic timepieces under the loupe at Perezcope
The Usual Suspects and the Rolex 'Deep Sea Special' No. 1 Scheme – Vintage Rolex and other iconic timepieces under the loupe at Perezcope — perezcope.com, Rights unverified — web image search result, review pending. Web page (perezcope.com)
The Rolex “Deep Sea Special” Is A Rare Timepiece Befitting Of Its Name
The Rolex “Deep Sea Special” Is A Rare Timepiece Befitting Of Its Name — augustman.com, Rights unverified — web image search result, review pending. Web page (augustman.com)

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Rolex, Wikipedia (English), retrieved 2026-10-28 (text CC BY-SA 4.0)
  2. Rolex, published history of the Deep Sea Special test pieces
  3. Smithsonian Institution, exhibition records

Where sources disagree, the disagreement is stated rather than resolved silently.