When we submerge under water the pressure surrounding u

A standard conventional Scuba Regulator is a(n):

When tank pressure is affecting breathing effort, we are talking about a(n)

The part that allows the diver to change the spring pressure or cracking point is called the:

The temperature inside the 1st stage may reach the freezing point:

The environmental sealed protection will:

Diving with a Full-Face Mask is difficult:

An OCEAN REEF Full-Face Mask system combines:

Some of the benefits of using an OCEAN REEF Full-Face Mask System are

What is the proper order for securing the Full Face Mask

The OCEAN REEF Full-Face Mask System has _____ sizes of face seal.

The OCEAN REEF Full-Face Mask Harness has ____ straps.

During inhalation with an OCEAN REEF Full-Face Mask, the air will flow:

The main function of the two one-way valves in the orinasal pocket is to:

The total air volume in an OCEAN REEF Full-Face mask includes:

Mix of used air and fresh air

What may be caused by a poor seal of the Orinasal Pocket?

The Surface Air Valve is meant for:

The purpose of the rotatable Exhaust Valve is to:

Out of Air and Bail-out drills are done the same way as with conventional Scuba equipment

Brand specific Full-Face Mask Training is available through

OCEAN REEF IDM’s are overpressure systems

What is the function of the two orinasal one-way valves?

CO2 buildup is possible if:

To be able to speak we need free movability of the _____

Limitations on using underwater communications equipment were due to:

Mechanical sound vibrations travel ______ faster in water.

Ultrasound sound waves will grow:

Underwater communication systems are

When using underwater communications you talk normally