A diving mask system is disclosed comprising a faceplate having a lateral partition on an interior surface delineating an upper and lower section, the lower section comprising a region that extends away from the upper section and includes at least one cutout section fitted with a complementary-shaped flexible insert that enables a user to grasp the nose. The faceplate further includes a rigid annular support frame either bonded to or extending out from a backside of said flange, the frame being configured within the outer periphery of said flange. A flexible annular sidewall skirt is attached to the support frame. The flexible skirt includes a lateral nose piece section attached to the partition. The lateral nose piece section having an inlet aperture and check valve for inhaled air, and an orifice through which an exhalation conduit having a separate check valve extends from the lower chamber to a snorkel device forming a passageway for exhaled air to pass through the upper chamber to the snorkel device. A quick-release clasp mechanism attached to the mask's elastic retention straps is also disclosed.

The present invention provides a snorkel having smaller respiratory dead space or volume. The snorkel includes a mouthpiece and a tube with an inhalation lumen and an exhalation lumen. A distal one-way inhalation valve is placed inside the inhalation lumen; and a distal one-way exhalation valve is placed inside the exhalation lumen. The invention also provides a method for reducing the volume of a respiratory dead space in a snorkel.

A breathing apparatus for a submersible craft is provided that includes a generally vertical tubular structure and a float configured to move vertically within the tubular structure between a first vertical position in which a third opening into the craft is unobstructed by the float and a second vertical position in which the third opening is fully obstructed by the float, and where the vertical position of the float is modulated based on the water level relative to the craft.

The disclosure relates to a diving mask, including: a mask having a breath cavity corresponding to a mouth and a nose of a user; a vent tube connected to the mask and provided with an inlet passage, the inlet passage communicating the breath cavity with external air; and an exhaust device communicating the breath cavity, the exhaust device including an exhaust fan configured to discharge air in the breath cavity into an external environment, thereby enabling the external air to flow into the breath cavity through the inlet passage.

A diving mask system is disclosed comprising a faceplate having a lateral partition on an interior surface delineating an upper and lower section, the lower section comprising a region that extends away from the upper section and includes at least one cutout opening fitted with a complementary-shaped flexible insert that enables a user to grasp the nose. The faceplate further includes a snorkel coupling having a passageway contained therein and conduits connecting the passageways with a lower chamber. The faceplate further includes a flexible tubular insert defining a passageway extending through the faceplate to the lower chamber. The tubular insert has a distal end dimensioned to fit and seal onto the mouthpiece receiver tube of a conventional second stage scuba regulator. The mask may be interchangeably configured for both scuba and snorkeling environments.

A survival helmet device for use in combination with a survival suit includes a helmet, inhale and exhale control valves, and at least one inflatable air cavity pocket secured to the survival suit for selectively controlling the air supply and buoyancy of the survival helmet device and the survival suit.

The mask for surface snorkeling comprises a rigid frame (2), a transparent visor (3), a soft face mask (4) applicable in an airtight way to the face of the user and having a membrane (7) which delimits an upper viewing chamber (8) being shaped to contain the eyes of the user and a lower breathing chamber (9) being shaped to contain the nose and mouth of the user, and a breathing circuit (5) connected to the lower chamber (9), a ventilation circuit of the upper chamber (8) independent and separated from the breathing circuit (5) also being provided.

The mask for surface snorkeling comprises a rigid frame (2), a transparent visor (3), a soft face mask (4) applicable in an airtight way to the face of the user and having a membrane (7) which delimits an upper viewing chamber (8) being shaped to contain the eyes of the user and a lower breathing chamber (9) being shaped to contain the nose and mouth of the user, and a breathing circuit (5) connected to the lower chamber (9), a ventilation circuit of the upper chamber (8) independent and separated from the breathing circuit (5) also being provided.

A snorkel assembly for underwater exercise including a snorkel tube, a mouthpiece portion and a valve seat is provided. The mouthpiece portion is configured to connect to and be in gas-communication with the snorkel tube. The valve seat is disposed in the snorkel tube or between the snorkel tube and the mouthpiece portion. The valve seat comprises a valve piece and a seat portion. The buckle portion of the valve piece is buckled to a buckle seat of the seat portion. The valve piece hangs on the seat portion with the buckle seat as a fulcrum. The valve piece is in a normally-open state when bearing no pressure, and is closed only when a user exhales.

A full-face mask, including a mask body, a breathing tube, an unfolded isolation support portion, at least one intake valve and at least one isolation plate, is provided. The mask body fits an user's face via a soft portion to form an interior space. The breathing tube is disposed on the mask body and is connecting with the interior space. The unfolded isolation support portion is disposed in the inner space and completely fits and covers the cheeks and the nose of the user to define an upper space and a lower space. At least one intake valve is disposed on the unfolded isolation support portion. A guide plate is disposed in a channel. Thus, the user could effectively breathe and exhale the air, and could isolate the face from the water leaking into the full mask to avoid danger.