Underwater Uses of Paracord: Diving and Marine Safety Tips
This is the 34th blog of the paracord blog series. You can check the other blogs I wrote from here – https://beadshub.co/blogs-paracord/
By Barry LeClair
Paracord Specialist – Based in Suburban Indiana
When it comes to reliable, multi-use gear for divers and boaters, paracord is one of the most underrated tools in your kit. As someone who’s spent years testing paracord solutions in different environments, I can say confidently—it’s just as useful underwater as it is on land. 🌊
In this blog, we’ll dive into specific ways paracord can support marine safety, underwater tasks, and quick fixes during your diving or boating trips. Whether you’re a recreational diver, fisherman, or simply someone who enjoys being near the water, this guide brings practical insight you can put to use.
Why Paracord Makes Sense for Marine Use
Paracord is lightweight, durable, quick-drying, and rot-resistant—key features when dealing with constant moisture, saltwater, and quick deployments. Unlike cotton ropes that degrade or heavy cords that absorb water, 550 paracord retains strength and usability in wet conditions.
Bonus: Its tight inner strands can be removed and used independently for things like fishing line, lashing, or stitching.
Top Underwater and Marine Applications for Paracord
1. Securing Dive Gear 🔗
Straps break. Buckles loosen. That’s why many divers use paracord as a redundant safety tether for masks, gauges, or lights. You can easily create custom-length gear keepers or backups with just a bit of 550 cord and a sliding knot.
➡️ Tip: Learn the adjustable grip hitch for a quick-release but secure hold.
2. Custom Dive Knife Lanyards
Attaching a paracord lanyard to your dive knife prevents accidental loss and gives you a reliable retrieval point—even with gloves on. Using a bead at the end of the lanyard (like the brass ones from BeadsHub) makes gripping easier and adds a cool custom touch.
3. Float Line Setup 🏊
For spearfishers and free divers, paracord can be a budget-friendly float line. Just ensure it’s highly visible—bright colors or reflective tracers help. Tie in float markers using bowlines or overhand knots.
4. Rigging and Lash Repairs Onboard
Whether you’re boating or sailing, paracord handles emergency lashings, broken cleats, or tie-downs like a champ. Wrap your paddle grips, secure deck gear, or create temporary anchor lines. It resists UV degradation better than basic rope.
5. Zipper Pulls and Zipper Replacements
Saltwater loves eating zippers. Replace corroded or broken pulls with custom paracord loops. Add a small brass bead to each for easier grip—even with wet or gloved hands.
6. Emergency Towline or Mooring Line 🚤
In calm conditions and short distances, tightly braided paracord can serve as an emergency towline or quick dock tie. Not ideal for long-term mooring, but very effective for short fixes.
Pro Tips from Experience
Double-up the cord when relying on it for life-preserving or heavy-duty tasks. Always test in a safe, non-critical situation first.
Avoid soaking wet paracord for long durations if you need maximum strength—it weakens by about 10-15% underwater.
Flush with fresh water after salt exposure to extend its life.
Use clean-finished knots like the Zeppelin Bend when joining two paracord lengths. Animated Knots is a great visual guide.
Adding Function with Style: Paracord Beads
Brass beads not only give your gear personality but can help identify different tools at a glance—especially underwater where visibility is limited. I add BeadsHub brass beads to my lanyards and pulls to increase tactile grip and style. If you’re DIY-ing gear for diving or boating, they’re worth checking out.
Useful Paracord Knots for Marine Use ⚓
Bowline – secure loop
Prusik Knot – sliding grip knot
Taut-Line Hitch – adjustable tension
Fisherman’s Knot – great for water use
Full tutorials at AnimatedKnots.com
Final Thoughts: Waterproof Versatility
From tying gear to rigging tools, paracord stands out in marine environments because of its strength-to-weight ratio, versatility, and reliability. If you dive, fish, kayak, or boat—it’s a must-have in your dry bag or gear box.
If you’ve ever used paracord underwater or on the water, I’d love to hear your ideas or tips too! Drop a comment below with your experience. 👇
And let me know—what kind of knife content would you be interested in for next week’s blog? Fixed blades for diving? EDCs with rustproof steel? I’m open to ideas!
