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The DOXA SUB 300 Carbon Searambler stands out for pairing the SUB 300’s dive-watch specification with a forged-carbon case and bezel. DOXA lists a titanium chamber and screw-down case back, 300-meter water resistance, and a 42.50 mm diameter. The official specifications make it possible to assess what the watch offers on paper; they do not establish how it wears or performs in independent testing.
What is the SUB 300 Carbon Searambler?
This is DOXA’s SUB 300 Carbon — Searambler, SKU 822.70.021.20. DOXA says the SUB 300 became available in an unlimited carbon edition in 2021; “unlimited” describes the edition rather than a stated production quantity. The Searambler name identifies the variant, while the carbon construction is the defining difference from the steel SUB 300 Searambler.
What does DOXA specify?
| Specification | DOXA-published detail |
|---|---|
| Case | Forged carbon, with a titanium chamber and screw-down case back |
| Dimensions | 42.50 mm diameter, 45.00 mm length, 13.40 mm height; 20.00 mm lug width |
| Water resistance | 30 ATM / 300 meters / 984 feet |
| Crown and crystal | Screw-down crown; sapphire crystal |
| Bezel | Unidirectional forged-carbon bezel with meter scale |
| Functions | Hours, minutes, seconds and date |
| Movement | Swiss self-winding mechanical movement, described by DOXA as COSC-certified; 38-hour power reserve; 28,800 vph (4.0 Hz). A caliber number and certificate record are not stated in the retrieved listing. |
| Strap and clasp | Black FKM rubber strap, folding clasp, black PVD coating and ratcheting wetsuit extension |
These are manufacturer-published specifications, not independently measured results. In particular, the 300-meter figure is DOXA’s stated water-resistance rating; it is not evidence here of an independent pressure test or a separate diving certification.
What the specifications do—and do not—tell you
The listed dimensions provide a useful starting point for judging fit, but diameter alone cannot predict how the watch sits on a particular wrist. The stated height is 13.40 mm, and the 45.00 mm length gives another reference point; try it on if fit is decisive. DOXA does not state the watch’s weight in the product information cited here.
#1 Best Overall
- LIMITED-EDITION DIVE WATCH WITH PREMIUM MATERIALS - The Aquadeep Submerge Carbon elevates the Aquadeep platform with premium materials and limited-edition exclusivity. Developed for enthusiasts seeking a more distinctive and collectible timepiece, it blends professional dive-watch functionality with contemporary design and advanced material technology.
- FORGED CARBON FIBER DIAL WITH HIGH-VISIBILITY DETAILS - At the center of the Submerge Carbon is a forged carbon fiber dial that creates a naturally layered texture unique to each watch. Paired with bright yellow accents for enhanced readability, the dial offers a bold and technical appearance inspired by modern performance equipment.
- NH37 AUTOMATIC MOVEMENT FOR MODERN MECHANICAL PERFORMANCE - The Aquadeep Submerge Carbon is powered by the Japanese NH37 automatic movement, providing dependable self-winding operation and consistent performance. Designed for mechanical watch enthusiasts, it combines reliability with the enduring appeal of an automatic movement.
- TITANIUM CASE WITH CARBON BEZEL TECHNOLOGY - Combining a DLC-coated titanium case with a carbon bezel, the Submerge Carbon showcases a more advanced material package than the standard Aquadeep. The lightweight construction enhances comfort while reinforcing the watch's modern, performance-oriented character.
- PREMIUM COLLECTOR'S DIVE WATCH DESIGN - With 300 meters of water resistance, the Submerge Carbon is built for real-world diving while emphasizing exclusivity, modern materials, and distinctive aesthetics. Rather than focusing on a higher depth rating, it differentiates itself through forged carbon construction, limited-edition status, and a more premium overall execution.
Likewise, the movement description offers a certification claim and reserve figure, not a full movement identification. DOXA’s US listing calls it a COSC-certified chronometer, but does not give a caliber number or certificate record. The listed 38-hour reserve and 28,800-vph frequency are specifications, not independent timekeeping results.
There is no independent evidence here about wrist comfort, bezel action, lume, underwater legibility, real-world accuracy, impact resistance, or pressure-test performance. Those qualities require hands-on evaluation; they should not be inferred from the material or depth rating.
Rank #2
- 𝗛𝗘𝗔𝗩𝗬 𝗗𝗨𝗧𝗬, 𝗛𝗜𝗚𝗛 𝗣𝗘𝗥𝗙𝗢𝗥𝗠𝗔𝗡𝗖𝗘 𝗗𝗜𝗩𝗘 𝗪𝗔𝗧𝗖𝗛: Built for diving enthusiasts, this high-performance watch is designed to withstand depths of up to 500 meters, making it ideal for high-impact water sports, scuba diving, and saturation diving.
- 𝗘𝗫𝗖𝗘𝗣𝗧𝗜𝗢𝗡𝗔𝗟 𝗟𝗜𝗚𝗛𝗧𝗪𝗘𝗜𝗚𝗛𝗧 𝗗𝗨𝗥𝗔𝗕𝗜𝗟𝗜𝗧𝗬: Crafted from Grade II Titanium with a sandblasted finish, our timepiece is 40% lighter than steel, offering ultimate comfort without compromising on durability. Hypoallergenic and highly resistant to corrosion from sea water and chlorine, it's built to withstand the toughest conditions while maintaining its sleek appearance.
- 𝗨𝗡𝗠𝗔𝗧𝗖𝗛𝗘𝗗 𝗖𝗟𝗔𝗥𝗜𝗧𝗬 & 𝗥𝗘𝗔𝗗𝗔𝗕𝗜𝗟𝗜𝗧𝗬 𝗢𝗙 𝗧𝗜𝗠𝗘: Experience unparalleled clarity and readability with our double dome sapphire crystal glass. No matter the angle, this feature ensures that time is easily readable, allowing you to stay on track with confidence and precision.
- 𝗨𝗟𝗧𝗜𝗠𝗔𝗧𝗘 𝗖𝗢𝗠𝗙𝗢𝗥𝗧 𝗢𝗡 𝗬𝗢𝗨𝗥 𝗪𝗥𝗜𝗦𝗧: Our timepiece comes with a rubber strap designed for unparalleled comfort, flexibility, and adaptability to your wrist's contours. Perfect for individuals leading active lifestyles or seeking all-day comfort, it ensures a snug and pleasant fit every time.
- 𝗥𝗘𝗡𝗢𝗪𝗡𝗘𝗗 𝗕𝗥𝗔𝗡𝗗 𝗔𝗡𝗗 𝗖𝗢𝗟𝗟𝗘𝗖𝗧𝗜𝗢𝗡: As part of the esteemed UNDONE brand, the Aquadeep Submerge belongs to a collection designed for serious divers and underwater enthusiasts.
Carbon Searambler versus the steel Searambler
DOXA’s US listing provides a direct comparison with the standard steel SUB 300 Searambler, SKU 821.10.021.10. Both models share the published 42.50-by-45.00 mm footprint, 13.40 mm height, 300-meter rating and automatic COSC-certified movement description. The clearest differences in the listing are case material, configuration choices and price.
| Detail | SUB 300 Carbon Searambler | SUB 300 Searambler (steel) |
|---|---|---|
| SKU | 822.70.021.20 | 821.10.021.10 |
| Case material | Forged carbon; titanium chamber and screw-down case back | Stainless steel |
| Dimensions and rating | 42.50 mm diameter × 45.00 mm length × 13.40 mm height; 300 meters | 42.50 mm diameter × 45.00 mm length × 13.40 mm height; 300 meters |
| Listed configuration | Black FKM rubber strap with folding clasp, black PVD coating and ratcheting wetsuit extension | Steel-bead or rubber strap configurations listed |
| US listing price snapshot | USD 4,390 | USD 2,890 |
| Weight | Not stated by DOXA in the cited product information | Not stated by DOXA in the cited product information |
The prices are snapshots from DOXA’s US storefront, not current guaranteed quotes. The listings show a USD 1,500 difference at the time they were recorded. That gap is relevant if the carbon look and construction are central to your choice; it is not, by itself, evidence that one model is better value or lighter on the wrist.
Rank #3
- Unique Carbon Fiber Dial: Each dial is crafted from carbon fiber, ensuring a unique, pattern exclusive to your watch. This high-tech material adds a distinctive style for both underwater missions and surface-level sophistication
- Rugged Style: Featuring an angular, multi-faceted case, this watch delivers a tough tool-watch aesthetic built for demanding environments. Its robust construction is ideal for professional diving, underwater exploration, and outdoor adventures
- Premium Materials: With accurate 9015 automatic movement, BGW9 lume, sapphire crystal, screw-down crown and case back, 316L stainless steel. Its robust construction handles extended diving, sailing, and harsh conditions with lasting reliability
- Lume & Waterproof: 200m water resistance meets BGW9 super-lume for true dive readiness. This combination ensures clear visibility in deep or murky water and reliability during extended underwater exploration
- Dimensions: Featuring a 11.5 mm thin profile, 6.5 mm crown, 40 mm case, 45.8 mm lugs to lugs, and total weight of 144 g, 220 mm in total length with 20 mm lug width, fitting wrists 6"–8.5"
Price, delivery and warranty
At the time the regional pages were recorded, DOXA listed the Carbon Searambler at USD 4,390 on its US storefront and EUR 4,190 on its European storefront. The European page estimated delivery at 10 working days; the US page stated same-day shipment for orders placed before noon EST, excluding preorders. Local taxes, including VAT where applicable, may be the customer’s responsibility. Prices, stock, shipping terms and tax treatment can change, so confirm them with the relevant local storefront before buying.
DOXA’s US product FAQ states that its watches come with a two-year warranty. Check the terms that apply in your region and confirm that the seller is authorized before purchase.
Quick Recap
Best Value
- Carbonox+
- Sapphire Crystal
- 316L Stainless Steel Back
- Swiss Automatic - SELLITA SW220-1
Rank #4
- Self-winding automatic movement - an Eco-friendly choice for discerning customer. Powered by everyday movement of your arm
- Automatic self-winding movement with analog display and sapphire crystal dial window
- Date calendar, water-resistant, luminous, chronograph
- Black rubber carbon fiber case with black dial
- Water resistant to 50 ATM / 500 meters / 1650 feet : suitable for professional marine activity serious surface water sports and skin diving
Who should consider it?
- Consider it if you want the SUB 300’s specified dimensions and depth rating in a forged-carbon design, and prefer the listed black rubber-strap configuration.
- Compare it with the steel model if material preference, strap or bracelet choice, or the difference in the recorded US listing prices matters more than having a carbon case.
- Try it on first if you are unsure about the 42.50 mm diameter, 45.00 mm length or 13.40 mm height; the published figures cannot establish comfort or fit.
- Ask for documentation if you need a caliber identifier or documentary evidence of the COSC claim; those details are not stated in the cited listing.
Sources
- DOXA US: SUB 300 Carbon Searambler product page
- DOXA Europe: SUB 300 Carbon Searambler product page
- DOXA US: SUB 300 Searambler product page
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
