THE MULTIPURPOSE AMPHIBIAN DIVE KNIFE

1
THE MULTIPURPOSE AMPHIBIANDIVE KNIFE
ULTRAMARINE
2
DEVELOPMENT
The ULTRAMARINE is the result of four years of
research and development, conducted by Extrema
Ratio in collaboration with Military Dive Teams
of the Italian Special Forces, Law Enforcement
Dive Teams and Civilian Underwater Operation
Experts.
3
OBJECTIVE
Units involved in underwater and amphibian
operations use a variety of specialty tools. The
main objective of the ULTRAMARINE Project is to
substitute these different tools with one
versatile utensil capable of performing the
multitude of tasks that professionals in the
fields are asked to perform in these difficult
and challenging operations..
4
FUNCTIONS

• The Primary Functions are
• FIELD OPERATION
• UNDERWATER OPERATION
• EMERGENCY TOOL
• SURVIVAL
• COMBAT
• Note Functions are prioritized by
  frequency of use in each sector.

5

• As with any respectable working tool, the mass of
  the blade has to be heavy enough to efficiently
  chop branches and shrubs in order to make
  emergency shelters, camouflage emplacements,
  stretchers, utensils or sector stakes.
• The serrations facilitate cutting rope when the
  blade is dull from wear tear.
• The steel tang can be used as a hammer or glass
  breaking tool.
• The sharp portion of the blade near the handle
  can be used for precision cutting whittling.

1. Field Operations
6
2. Underwater Operations
The slot in the blade was developed for
use as a screw-pin shackle wrench.
To avoid damaging buoyancy or flotation devices
during on-board operations with the exposed metal
components of the knife, a flap was incorporated
to cover the sheath knife.
7
Underwater Operations
The retention lanyard allows the user to
work on equipment without having to sheath the
knife.
8
Underwater Operations

• The handle was designed with a plus sized grip
  a special anti-slip material developed by Extrema
  Ratio to facilitate retention while wearing
  neoprene gloves.

9
Underwater Operations

• With load positioned on the weakest end of the
  line cutter the blade withstands a load index of
  45 kg (99 lbs).

10
Underwater Operations

• On the blade with screw - pin shackle wrench
  slot, with load positioned in the center, the
  blade withstands a load index of 70 kg (154 lbs).

11
Underwater Operations

• On the blade without screw-pin shackle wrench
  slot, with load positioned in the center, the
  blade withstands a load index of 180 kg (396
  lbs).

12
3. Emergency Tool

• The sheath is designed to be sleek and
  hydrodynamic, with a close, tight fit to the body
  that reduces the possibility of entanglements.
• The sheath also has a quick-release function that
  allows the knife to be rapidly drawn by simply
  pulling on the upper portion of the protective
  flap.
• The protective flap uses special anti-wet snap
  fasteners that are specifically designed for
  water environments.
• O-ring and retention system are disabled with a
  strong pull.
• In panic or shock situations the user will have
  access to the knife.

13
Emergency Tool continued

• The knife is designed with a specialized net
  line cutting system for use in entanglement
  emergencies.
• The knife is designed with reduced hilt guards
  to reduce the chance of entanglement and snaring
  while in use.

14
Emergency Tool continued

• The design of the handle allows the operator to
  distinguish the orientation of the blade by feel
  in low light / no light situations.
• The pointed tang was developed as a glass break
  device.

15
4. Survival

• Besides being a good camp knife the ULTRAMARINE
  was designed so the handle could be disassembled,
  the blade attached to a pole and used as a spear.

16
Survival

• The blade has been treated with a matt finish to
  reduce light reflection wile operating in hostile
  environments.
• The sheath incorporates two sharpening diamond
  sharpening plates one for the primary blade and
  the second for the net cutter.

17
5. Combat

• The symmetric dagger shape of the blade and a
  balance point biased toward the handle make the
  ULTRAMARINE an excellent fighting knife.
• The pointed steel tang can be used as a blunt
  force weapon.

18
Airborne Operations

• The hard sheath combined with a sleek design
  make the ULTRAMARINE a safe and effective
  solution for use in airborne operations, which
  eliminates the issues of mid-air entanglements,
  towed jumpers and operator impalement.

19
Sheaths

• The ULTRAMARINE was conceived as a multi
  use, amphibian knife. As such it needs to rapidly
  and easily transition from the operators
  waterborne equipment to his field tactical gear.
  To meet this requirement Extrema Ratio developed
  two separate sheaths
• The Dive Sheath
• The Field Sheath

20
Dive Sheath

• The Dive Sheath is a rigid sheath made of ABS
  plastic which can be worn on the ankle or mounted
  to equipment webbing with a TEK-LOK fastener.

21
Field Sheath

• The optional Field Sheath is M.OL.L.E. system
  compatible and can be attached to a variety of
  field and tactical equipment.

22
Construction Materials
Waterborne operations, in particular saltwater
ops, place inordinate amounts of wear on
operational equipment. To alleviate this problem
the ULTRAMARINE was developed using new concepts
and materials that guarantee the durability of
the utensil. The philosophy behind the
ULTRAMARINE Project is not to attract the
potential buyer with the use of exotic or
futuristic materials and applications, but to
develop a functional and durable tool made out of
carefully selected and extensively tested
components.
23
Construction Materials

• Sheath
• The sheath is composed of two detachable parts
• 1- The soft part is made of polyamide
  bonded with polyethylene.
• 2- The hard part in ABS plastic welded
  together with a specialized binary epoxy.
• The elastic straps are doubled.
• Accessories are made of polyamide.
• The snap fasteners are specifically designed for
  wet environments.

24
Construction Materials
Handle The handle is a single cylindrical
block of polyamide. The tang and other
components are stainless steel. Blade The
blade is made of Cobalt Steel N690 This steel is
certified by Extrema Ratio to pass all oxidation
tests under N.A.T.O testing standards.
25
Stainless Steel

• Stainless Steel is subdivided into three
  families
• - Martensistic
• - Austensistic
• - Ferritic
• Austensistic and Ferritic have the highest
  levels of oxidation reistance, but are not
  hardenable by heat treatment. A certain level of
  Rockwell Hardness (HRC) is necessary for edge
  retention and the production of a long lasting
  blade.
• Martinsistic Steel has a good level of
  corrosion resistance, especially when it contains
  high levels of Chrome (min 12, N690 contains
  17), and can be readily tempered.
• Martinsistic Steel needs same level of
  maintenance of portable weapons in underwater
  environment.

26
EOD Blade
The EOD version is available upon request. In the
EOD model all steel components are replaced with
Titanium components that have a neglegible
magnetic mass. This version is recommended only
for EOD use because even though Extrema Ratio
uses only the highest grade of titanium (Grade 5
_at_ 40 HRC), this metal is still a fairly soft
alloy that is difficult to sharpen and does not
hold and edge well.
27
Blade Finish

• Most military knives use a factory treated
  coating such as Teflon to dull and protect the
  blade from oxidation. The problem with this
  method is that when the protective coating gets
  scratched or worn with use leaving the raw metal
  exposed to the environment and to oxidation.
• Commercial dive knives us a highly polished
  finish to protect the blades from oxidation.
• Neither of these options is suitable for the
  ULTRAMARINE knife, so Extrema Ratio decided to
  adopt a renewable protective film called
  LUBRA-SKIN. This coating can be easily reapplied
  during regular knife maintenance.

28
LUBRA-SKIN
LUBRA-SKIN is a silicone based product
specifically developed for Extrema Ratio. This
spray is easily applied to all disassembled steel
parts and creates a waterproof protective film
which prevents salt water from adhering to the
metal and causing oxidation.
29
Maintenance

• For ease of maintenance the knife handle can be
  disassembled without the use of tools.
• Simply rinsing the knife in fresh water is
  sufficient to prevent oxidation.
• The inside of the sheath is smooth for easy
  rinsing and to prevent salt deposits from
  sticking to the sheath and being pressed against
  the blade.

30
Additional Maintenance

• For additional wear and tear most components can
  be disassembled and replaced.
• The O-ring can easily be disassembled and
  substituted.
• Spare components are provided as part of a
  standard package.

31
Additional Maintenance

• The female threading inside the handle is
  subject to oxidation but is not fixed and can
  easily be substituted.

32
ULTRAMARINE
TECHNICAL DESCRIPTION MEASUREMENTS Total length
mm 298 Blade length mm 150 Blade thickness mm
6,3 Overall length (knife in sheath) mm
320 Overall thickness (knife in sheath) mm
55 WEIGHTS Sheath weight g 280 Knife w/o
screw-pin shackle wrench slot g 390 Knife with
screw-pin shackle wrench slot g
375 MATERIALS Blade steel Bohler N690,
X105CrCoMo182 (EOD version titanium grade
5) Metal parts and screws AISI 303,AISI 304 e
AISI 420 Handle Polyamide (Nylon) Hard sheath
ABS Soft sheath Cordura, polyamide, polyethylene
foam, accessories in polyamide.
33
Thank You