Step 5: Enhancing Underwater Communication

SeaLuke
Mar 10, 2025
5 min read

Updated: Apr 27, 2025

Over the past weeks, we’ve explored key elements that help divers build confidence and control. We began by addressing dive anxiety and fear, learning how to shift our mindset and sharpen our skills through structured practice. We then focused on relaxation techniques to enhance comfort and improve air consumption. Now, it’s time to focus on an essential skill that can make or break a dive: effective communication underwater.

Why Communication Matters in Diving

Underwater communication is vital for safety, coordination, and overall dive enjoyment. Unlike on land, where verbal communication is easy, divers must rely on hand signals, body language, and sometimes writing tools to convey information. Misunderstandings can lead to stress, disorientation, or even dangerous situations.

Even highly trained instructors and divemasters can struggle with communication underwater. The more variables we introduce into our dive plans—like currents, low visibility, or multi-level dives—the more complex the thoughts we need to convey become. Clear and confident communication can prevent small issues from escalating

into larger problems and make for a smoother, more enjoyable dive.

Scuba diver underwater holding a yellow sign saying "I ❤️ YOU" in clear blue ocean. Wearing orange suit and goggles, with joyful vibe. — An erasable dive slate has been an essential part of my personal dive kit for years. Its great for communication, like telling your dive buddy who just found your lost flashlight what you think about them!

Mastering Dive Signals

Learn and Practice Standard Signals Make sure you know the universal hand signals used in diving and practice them regularly. Signals for "OK," "ascend," "descend," "problem," and "out of air" should be second nature. The quicker you can give and interpret these signals, the better you’ll be able to respond in real-time.
Discuss Signals Before the Dive Many divers feel embarrassed to review hand signals with their buddies before a dive, but it makes a huge difference! Take a few minutes to confirm the signals you'll use, especially for specific situations like pointing out marine life or managing issues.
Use a Dive Slate for Complex Communication Some messages are too complex to convey with hand signals alone. Carrying a dive slate or an underwater notepad allows you to write out detailed thoughts or instructions. This can be a game-changer when something critical needs to be communicated.
Be Aware of Non-Verbal Cues Communication isn't just about signals—it’s also about body language. Pay attention to your buddy's breathing rate, swimming style, and eye contact. Changes in these can signal discomfort, fatigue, or stress before a problem arises.
Establish a Signal for Immediate Attention If you need your buddy’s attention immediately, establish a unique signal—like a hand wave or tapping your tank—to avoid confusion in stressful situations. A well-timed signal can stop a small issue from becoming a big one.
Call Your Buddy a Name! Sometimes you need to get your buddy’s attention quickly. If a hand signal isn’t working, a quick name call through your regulator or tapping your tank can help get their focus.

Using Audible Signaling Devices

Sometimes hand signals and body language aren’t enough. That’s where audible signaling devices come in.

Rattles and Tank Bangers – Small rattles or tank bangers (a simple brass clip or similar object) can be used tocreate a sharp sound by tapping on your tank. This can get your buddy’s attention even in low visibility or strong currents.
Low-Pressure Inflator Whistles – Some BCDs come with a whistle integrated into the low-pressure inflator. This can be useful for attracting attention at the surface or underwater in emergencies.
Use Sparingly – Audible signals should be used only when necessary. A diver who constantly rattles or bangs on their tank risks being ignored when it really matters.
- Remember the story of The Boy Who Cried Wolf? If you use your signaling device too often, people will stop paying attention when it matters most. It’s like the diver who cried "Fish!"—he used his rattle so often that when he was actually in trouble, nobody turned to see him struggling. Don’t be that diver.

Avoid Using Knives – Tapping your tank with a dive knife is discouraged. It’s not only unsafe but also an unnecessary risk when safer options are available.

A Story from the Field

On a recent dive trip, I had two buddies who got separated in moderate visibility. One of them started to feel disoriented but didn’t know how to signal for help beyond the basic "problem" sign. Luckily, the other diver had a dive slate and quickly wrote, "You OK? Let’s ascend together." That small piece of communication not only solved the issue but also prevented the situation from escalating. A simple slate saved the dive and boosted the confidence of both divers.

Common Communication Mistakes and How to Avoid Them

Overcomplicating Signals – Keep signals simple and clear. Trying to invent complex signals on the spot can confuse your buddy.
Failing to Review Signals – Don’t assume your buddy knows the same signals you do. A quick review before the dive ensures you're both on the same page.
Ignoring Miscommunication – If a signal is misunderstood, stop and clarify it immediately.

Practicing Communication Skills on Land

Review Signals with Your Buddy – Sit down with your dive buddy and go over the most common signals. Make sure you both interpret them the same way.
Use Dry Runs – Practice using hand signals while wearing your gear. Muscle memory will help you signal confidently underwater.
Introduce Complex Thoughts with a Slate – Get comfortable writing on a dive slate or underwater notepad.

Your Challenge This Week

Review signals with somebody. Even if your favorite dive buddy isn't around, use some hand signs around the house to see if you are communicating well with your spouse or children. It's a fun game of charades but it goes a long way in expressing yourself underwater when the time comes.
Introduce a dive slate. If you don’t already carry a dive slate, pick one up and practice using it to write simple messages underwater. I personally love ones that can be erased quickly so that you can keep writing or use them multiple times throughout the dive. Find a good anchor point on your Scuba System where it will stay secured and out of the way but easily retrieved should you need it.
Create a backup signal. Work with your buddy to create a simple signal to get each other's attention if typical hand signals don’t work. A rattle or noise maker of some sort works well. Again if you don't have one yet now is a good time to find one and a safe place to secure it to your Scuba System.