The present invention is generally directed to a floatation device for a snorkel, including a body made from a buoyant material; and an orifice penetrating through the body, the orifice sized to receive a snorkel, such that the floatation device provides sufficient buoyancy to float a snorkel and an attached mask on the surface of water. More specifically, the body may be brightly colored and the orifice may be sized to cause an interference fit with an inserted snorkel. In accordance with some embodiments, the body may be wrapped or covered in a second material.

A multi-user virtual reality system for providing a virtual reality experience to a plurality of users in a body of water includes a reference system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes equipment configured to be mounted to a first user in the body of water, wherein the equipment includes a first display unit and a first signal emitting or receiving system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes equipment configured to be mounted to a second user in the body of water, wherein the equipment includes a second display unit and a second signal emitting or receiving system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes a data processing system including one or more data processing units. The data processing system is configured for determining a position of the first user in the body of water based on at least one signal transmitted between the first signal emitting or receiving system and the reference system. The data processing system is configured for determining a position of the second user in the body of water based on at least one signal transmitted between the second signal emitting or receiving system and the reference system. The data processing system is configured for determining whether the second user in the body of water is within a first target region 480 relative to the first user in the body of water. The data processing system is configured for instructing the first display unit to display virtual reality content to the first user in the body of water. If it is determined that the second user in the body of water is inside the first target region relative to the first user, the displayed virtual reality content includes a representation of the second user.

A multi-user virtual reality system for providing a virtual reality experience to a plurality of users in a body of water includes a reference system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes equipment configured to be mounted to a first user in the body of water, wherein the equipment includes a first display unit and a first signal emitting or receiving system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes equipment configured to be mounted to a second user in the body of water, wherein the equipment includes a second display unit and a second signal emitting or receiving system adapted for emitting and/or receiving signals. The multi-user virtual reality system includes a data processing system including one or more data processing units. The data processing system is configured for determining a position of the first user in the body of water based on at least one signal transmitted between the first signal emitting or receiving system and the reference system. The data processing system is configured for determining a position of the second user in the body of water based on at least one signal transmitted between the second signal emitting or receiving system and the reference system. The data processing system is configured for determining whether the second user in the body of water is within a first target region 480 relative to the first user in the body of water. The data processing system is configured for instructing the first display unit to display virtual reality content to the first user in the body of water. If it is determined that the second user in the body of water is inside the first target region relative to the first user, the displayed virtual reality content includes a representation of the second user.

A snorkeling breathing apparatus includes a mask, a first breathing tube assembly and a one-way exhaust valve. The mask includes an outer mask and a breathing mask arranged in the outer mask, the mask is equipped with a breathing chamber. The breathing tube assembly includes a first breathing tube and a one-way inhaling valve. The breathing tube is connected to the breathing mask through the inhaling valve. The exhaust valve is connected and mounted on the outer mask and the breathing mask. While inhaling, the inhaling valve conducts and air enters the chamber through the breathing tube. While exhaling, the exhaust valve conducts and air flows from the chamber to outside.

A snorkeling breathing apparatus includes a mask, a first breathing tube assembly and a one-way exhaust valve. The mask includes an outer mask and a breathing mask arranged in the outer mask, the mask is equipped with a breathing chamber. The breathing tube assembly includes a first breathing tube and a one-way inhaling valve. The breathing tube is connected to the breathing mask through the inhaling valve. The exhaust valve is connected and mounted on the outer mask and the breathing mask. While inhaling, the inhaling valve conducts and air enters the chamber through the breathing tube. While exhaling, the exhaust valve conducts and air flows from the chamber to outside.

A diaphragm or non-return valve is disposed in a supporting wall and includes a diaphragm plug and a valve seat having a passage opening surrounded by a continuous surface for sealing adhesion contact of a sealing lip of the diaphragm plug. The diaphragm plug is made as one piece and is of the same elastic, flexible material as the supporting wall, from which the diaphragm plug is separated along its perimetric edge by slots having a predetermined length. The diaphragm plug and the supporting wall are connected by at least two material bridges provided on opposite sides of the perimetric edge of the diaphragm plug, and the valve seat is configured as a shaped plate locked to the supporting wall in a position coincident with the diaphragm plug by a tightening ring, the valve seat and the tightening ring being engaged by elements passing through at least part of the slots.

A diaphragm or non-return valve is disposed in a supporting wall and includes a diaphragm plug and a valve seat having a passage opening surrounded by a continuous surface for sealing adhesion contact of a sealing lip of the diaphragm plug. The diaphragm plug is made as one piece and is of the same elastic, flexible material as the supporting wall, from which the diaphragm plug is separated along its perimetric edge by slots having a predetermined length. The diaphragm plug and the supporting wall are connected by at least two material bridges provided on opposite sides of the perimetric edge of the diaphragm plug, and the valve seat is configured as a shaped plate locked to the supporting wall in a position coincident with the diaphragm plug by a tightening ring, the valve seat and the tightening ring being engaged by elements passing through at least part of the slots.

A full-face diving mask includes a mask and a breathing tube. The mask includes an outer frame, a lens housing and a fitting mask. The fitting mask includes a partition plate. The partition plate and the inner surface of the lens housing define an observation chamber on the top and a breathing chamber below. The partition plate includes at least one air intake port to allow inhaled air to be guided and circulated through at least one air intake passageway from the observation chamber toward the breathing chamber. The breathing chamber is further provided with an air compartment partition plate connected to the partition plate to define an air discharge compartment. The air compartment partition plate is provided with at least one air discharge port to allow exhaled air to be guided through at least one air discharge passageway from the air discharge compartment and discharged along the breathing tube.

A full-face diving mask includes a mask and a breathing tube. The mask includes an outer frame, a lens housing and a fitting mask. The fitting mask includes a partition plate. The partition plate and the inner surface of the lens housing define an observation chamber on the top and a breathing chamber below. The partition plate includes at least one air intake port to allow inhaled air to be guided and circulated through at least one air intake passageway from the observation chamber toward the breathing chamber. The breathing chamber is further provided with an air compartment partition plate connected to the partition plate to define an air discharge compartment. The air compartment partition plate is provided with at least one air discharge port to allow exhaled air to be guided through at least one air discharge passageway from the air discharge compartment and discharged along the breathing tube.

Diving mask including a snorkel with a valve, the valve including a valve orifice configured to allow fluid circulation between an outside of the snorkel and an inside of the snorkel, and a valve closure member, which can move between an open position in which the valve orifice is open and a closed position in which the valve orifice is closed by the valve closure member, wherein the mask includes a balancing means for limiting a pressure difference between the internal pressure of the mask and the external pressure, the balancing means being configured to allow fluid circulation between the outside of the mask and the inside of the mask when the mask is used by a user and when the closure member is in the closed position.