U.S. Navy Seal Rebreather equipment:

With Rebreather equipment underwater there are no bubbles coming up at all so no one knows you are there when traveling underwater. Even the electric motors with propellers that transport Navy Seals underwater are so quiet most people would never hear them or know that they are there. 

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Navy SEALs utilize closed-circuit rebreathers, such as the Dräger LAR V (MK 25) and Siel Caimano MK4/SEAL MK1, for stealthy, bubble-free, and long-duration underwater missions. These 100% oxygen or mixed-gas systems recycle exhaled gas through a CO2 scrubber, featuring low magnetic signatures, and compact, ergonomic designs for tactical operations. 

This video explains the basics of how rebreathers work:

59s

Simply Scuba

YouTube • Feb 28, 2021

Key Equipment & Components

• Dräger LAR V (MK 25): A standard 100% oxygen closed-circuit rebreather (CCR) used for special diving units.
• Siel Caimano MK4 CDV PRO: 4th gen oxygen rebreather, 240-minute endurance, 10 kg.
• Siel SEAL MK1 PRO: Compact 90-minute oxygen rebreather, 6 kg, suited for boarding and tactical ops.
• Components: Breathing loop, CO2 scrubber (soda lime), oxygen supply system, and counterlung.
• Safety Features: Often equipped with three oxygen sensors for redundancy, with some models allowing for CO2 sensor installation. 

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Operational Details

• Oxygen Use: 100% oxygen systems are used to avoid detection via bubbles.
• Depth and Time: Siel SEAL MK1 Pro is rated for depths >12 meters (40 fsw).
• Maintenance: Uses consumables like Sofnolime (CO2 absorbent), Tribolube (O2-compatible lubricant), and sanitizers. 

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