THE DEEP SPEARFISHING STORY
Deep Spearfishing is a specialized carbon fin designed for spearfishing beyond 30 metres, where powerful and reliable propulsion is essential during demanding descents and ascents.
The blade is engineered to provide strong initial thrust during the first metres of the ascent, helping the diver gain upward momentum quickly when returning from depth. Progressive flex then supports efficient energy transfer throughout the remainder of the ascent, while maintaining stability and control in demanding conditions and currents.
WHY DEEP SPEARFISHING?
POWER
Designed to deliver powerful and efficient propulsion during demanding deep dives and ascents.
INITIAL THRUST
Strong initial thrust in the first metres of the ascent helps the diver gain upward momentum quickly when returning from depth.
DURABILITY
Built for intensive use with high-quality materials and controlled manufacturing processes. Deep Spearfishing carbon fins are designed for years of demanding use, with many divers still using their fins after 9+ years.
Choose the hardness according to your body weight and preferred fin stiffness.
Soft · 70–85 kg (154–187 lbs)
Medium · 85–95 kg (187–209 lbs)
Hard · 95–105 kg (209–231 lbs)
Hardness selection: Our hardness recommendations are based on the diver’s body weight, assuming approximately 4–6 kg (9–13 lbs) of lead is used for dives beyond 15–20 m. Individual preferences, diving technique and physical strength may also influence the ideal hardness.
If you are between two options or are unsure which hardness is right for you, contact us for a recommendation.
Mares Razor
Omer Stingray
Pathos
Custom foot pocket options are also available on request, including C4, Cressi, Seac, Spetton and Picasso.
Total blade length — by foot pocket
Mares Razor · 812 mm
Omer Stingray · 814 mm
Pathos · 790 mm
Standard blade dimensions
Bending length · 667 mm
Blade width · 190 mm
Blade angle · 22°
Bending curve: J-shaped
100% high-tensile carbon fiber combined with a specially formulated epoxy system.
The blade features a variable structure, with controlled stiffness distribution designed to provide powerful propulsion while maintaining progressive flex.
BlackTech uses laser-controlled carbon layer positioning to achieve consistent blade characteristics and precise stiffness distribution.
The blades are manufactured using VRTM technology with high temperature and high vacuum processing to achieve a highly consistent laminate with 0% void level.
The manufacturing environment is controlled for temperature and humidity. Each carbon blade undergoes two 14-hour post-curing cycles controlled by PLC technology with temperature deviation of less than ±0.1°C.
The result is a precisely manufactured carbon blade designed for powerful, controlled and efficient propulsion during deep diving.
Deep Spearfishing features blue water rails designed to improve water flow during blade flexing, helping to reduce turbulence and improve stability and handling.
The blades feature BlackTech's signature mirror finish on the front and back surfaces.
Deep Spearfishing is designed for experienced spearfishers who primarily focus on deep vertical diving.
It is particularly suited to:
• Deep spearfishing beyond 30 metres
• Powerful and demanding ascents
• Diving in currents
• Divers who prioritize strong vertical propulsion
• Spearfishers looking for a specialized deep-diving carbon fin
For shallow-water hunting, long surface swimming or general-purpose use, consider our Normal Spearfishing & Freediving or CST Competition models..
Deep Spearfishing carbon blades come with a 3-year written warranty.
The warranty applies according to BlackTech's official warranty terms.
BlackTech blades are produced upon order.
Typical production time is 25–45 business days, depending on current production workload.
Made in EU.
Who are Deep Spearfishing fins designed for?
They are designed primarily for spearfishers who focus on deep vertical diving, demanding ascents and diving in currents.
Which hardness should I choose?
Soft is designed for divers weighing 70–85 kg (154–187 lbs), Medium for 85–95 kg (187–209 lbs) and Hard for 95–105 kg (209–231 lbs). If you are between two options or are unsure, contact us for a recommendation.
Can I use Deep Spearfishing fins in shallow water?
They can be used in shallow water, but the model is specifically developed for deep vertical spearfishing. For a more versatile all-round fin, consider Normal Spearfishing & Freediving or CST Competition.
Which foot pockets are available?
Deep Spearfishing is available with Mares Razor, Omer Stingray and Pathos foot pockets. Other foot pockets can be prepared on request.
How deep can I dive with Deep Spearfishing fins?
The model is designed for deep vertical spearfishing, including dives beyond 30 metres. Actual diving depth should always depend on the individual diver's training, experience and safety procedures.
How long does production take?
Typical production time is 25–45 business days, depending on current workload.
Is Deep Spearfishing covered by a warranty?
Yes. The carbon fins come with a 3-year written warranty according to BlackTech's warranty terms.
| Hardness | Soft — 70 kg (154 lbs) to 85 kg (187 lbs), Medium — 85 kg (187 lbs) to 95 kg (209 lbs), Hard — 95 kg (209 lbs) plus |
|---|---|
| Footpockets | Mares Razor, Omer Stingray, Pathos |
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