A diving harness containing the upper junction connected through the central rail and shoulder straps to the lower junction connected with the hip belt and the crotch strap tied with the buckle, characterized in that the upper junction is permanently connected to the central rail containing at least two layers of textile tapes that are in contact with each other, wherein the textile tape layers are sewn together at regular intervals with back tacks forming through openings between tape layers, wherein the lower junction is permanently connected to at least one mounting bracket, and, wherein the mounting bracket is detachable connected to the central rail via the through opening.

A backrest for scuba diving comprising a support element, a first strap strapping the support element to the diver's body and a second strap strapping an air cylinder to the support element. The support element has first slots passing the first strap and second slots passing the second strap. The first slots delimit a right portion and respectively a left portion of the first strap, independently adjustable over the right shoulder and right side and respectively over the left shoulder and left side of the diver. The support element comprises a support plate, a right angular profile having a first and second right wing, a right bracket supported by the first right wing, a left angular profile having a first and second left wing, a left bracket supported by the first left wing.

A backrest for a scuba diver comprising a shaped plate supporting at least one air cylinder, at least a first strap comprising an upper right portion configured to fit around the scuba diver's right shoulder, an upper left portion configured to fit around the scuba diver's left shoulder and a lower portion configured to fit around the scuba diver's abdomen, wherein the shaped plate has a first right slide-through element and a first left slide-through element adapted to connect the upper right portion and the upper left portion, respectively, to the lower portion of the first strap, at least one weight pocket constrained to the lower portion of the first strap, wherein there is provided an anti-torsion means connecting the at least one weight pocket to the shaped plate and configured to oppose the torsion of the first strap in proximity to at least one of the first slide-through elements.

A backrest for a scuba diver comprising: a strap , having an upper right portion fitting around the diver’s right shoulder, an upper left portion fitting around the diver’s left shoulder and a lower portion fitting around the diver’s abdomen, a right adjustment block between the upper right portion and the lower portion, and a left adjustment block between the upper left portion and the lower portion., Each of the adjustment blocks has a first pin engaged in a first loop of one end of the upper portion, a second pin engaged in a second loop of one end of the lower portion, a clamp clamping the lower portion of the strap to block the sliding of the end of the lower portion of the strap around the second pin, and a handgrip actuating the clamp between blocking and unblocking the sliding of the end of the lower portion of the strap around the second pin.

The buoyancy control device for scuba diving comprises an air bladder, a harness comprising at least two shoulder straps and an abdominal strap made up of two abdominal half-straps, a backrest provided with first slots engaged by the abdominal half-straps, second slots engaged by at least one retaining strap for retaining at least one air cylinder, one or more third slots engaged by the two shoulder straps, and one or more fourth slots engaged by corresponding straps for connecting the backrest to the air bladder.

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.

A buoyancy compensator bladder includes an air cell, a connector, a low-pressure inflator (LPI), and at least one over pressure valve. The LPI which inflates and deflates the air cell is positioned on an outer surface of the air cell. As a result, when the fully assembled buoyancy compensator is equipped by a diver, the LPI runs from behind the diver's torso and under their armpit. This results in the inflator head which is part of the LPI to be disposed on the front of the diver's chest during back mount or side mount diving. This structure allows the bladder to be easily used for either back mount or side mount diving. The bladder may further be equipped with auxiliary/non-essential devices such as wight pockets/pouches.

A backrest for scuba diving comprising a support element, a first strap strapping the support element to the diver's body and a second strap strapping an air cylinder to the support element. The support element has first slots passing the first strap and second slots passing the second strap. The first slots delimit a right portion and respectively a left portion of the first strap, independently adjustable over the right shoulder and right side and respectively over the left shoulder and left side of the diver. The support element comprises a support plate, a right angular profile having a first and second right wing, a right bracket supported by the first right wing, a left angular profile having a first and second left wing, a left bracket supported by the first left wing.

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.

An underwater recreation system for diving instruction and method of its use. The method includes providing a series of learning steps with diving techniques and instructions to practice at incrementally deeper depths and providing a surface floating depth limitation device that restricts the learning user to the particular maximum depth of their learning step. The apparatus for carrying out the method of diving instruction includes a surface floating depth limitation device with the means to connect to the breathing hose of a surface supplied air supply.