Some embodiments may be of spearfishing apparatus fitted with at least one magnet configured to repel sharks away from the spearfishing apparatus. The spearfishing apparatus may be one or more of: a spearfishing shaft, a spearfishing tip, and/or a spearfishing gun. Such magnets may be electromagnets powered by batteries in some embodiments.

A buoyancy control device for scuba diving comprising at least two shoulder straps, each shoulder strap having an upper portion and a lower portion joined by a closing buckle comprising a male buckle element and a female buckle element, which has a first connection means for connecting to the upper portion of the shoulder strap and a second connection means for connecting to the male buckle element, wherein the female buckle element comprises a first part that has the first connection means, a second part that has the second connection means, and an articulated connection pin for connecting the first part to the second part.

Provided is an air injection device. The air injection device includes: a body having an air passage formed therein; and an opening and closing part coupled to one end periphery of the body and having an opening and closing protrusion protruding from an inner surface thereof toward the air passage of the body by a given length in such a manner as to open and close the air passage, wherein the opening and closing protrusion is moved in a first direction toward the body or in a second direction opposite to the first direction by means of a user's control for the opening and closing part, and the movement of the opening and closing protrusion in the first direction or in the second direction is guided by means of a guide groove formed on an outer peripheral surface of one end portion of the body and a guide protrusion formed on the inner peripheral surface of the opening and closing part in such a manner as to be inserted into the guide groove.

Some embodiments may be of spearfishing apparatus fitted with at least one magnet configured to repel sharks away from the spearfishing apparatus. The spearfishing apparatus may be one or more of: a spearfishing shaft, a spearfishing tip, and/or a spearfishing gun. Some embodiments may be of personal floatation devices (PFDs) fitted with at least one magnet configured to repel sharks away from the PFDs. Some PFDs may be fitted with a tethered drop-down magnetic apparatus to protect lower extremities of a wearer of such PFDs. Such magnets may be electromagnets powered by batteries in some embodiments.

A cold weather survival suit includes a principal body cavity having pneumatically connected extensions to fit body extremities and a coverable cranial opening. The structure of the suit includes a layered structure of mechanically interconnected suits within suits. A composite of tear-proof and insulation material forms an internal suit or first envelope that is surrounded by a waterproof suit and then by a tear resistant suit.

A body-enhanced life jacket includes a life jacket and an undergarment within the life jacket. The undergarment is configured to shape and provide support for a user's breasts.

One or more specific embodiments herein includes a personal flotation device, comprising a vest capable of floating in water and having front panels; a power source; a light source; at least two support straps; a first electrical cable; and a second electrical cable. Further, the first electrical cable and the second electrical cable are capable of being connected to one another to form a connector assembly through which electrical current is capable of flowing, and the connector assembly includes a housing for preventing water from contacting the electrical current when the connector assembly is formed.

An integrated tourniquet system is provided that, in some embodiments, provides for a specially designed pocket integrated within a garment or flotation device wherein the pocket is configured to removably retain a one-handed tourniquet having, in some embodiments, a windlass system.

Some embodiments may be of spearfishing apparatus fitted with at least one magnet configured to repel sharks away from the spearfishing apparatus. The spearfishing apparatus may be one or more of: a spearfishing shaft, a spearfishing tip, and/or a spearfishing gun. Some embodiments may be of personal floatation devices (PFDs) fitted with at least one magnet configured to repel sharks away from the PFDs. Some PFDs may be fitted with a tethered drop-down magnetic apparatus to protect lower extremities of a wearer of such PFDs. Such magnets may be electromagnets powered by batteries in some embodiments.

A rain bib garment is provided, wherein the rain bib garment includes buoyant elements that may be employed so that a wearer may float in water, should the need arise, and further includes means for providing a substantially water-tight seal between the rain bib and a wearer at an upper portion of the rain bib.