Use Case: Standardizing Scuba Communication Through Technical Illustration for The Dive Otter

Clear communication underwater is not optional—it is essential for safety, coordination, and overall dive experience. When my U.S.-based client, The Dive Otter, approached me, their goal was ambitious: to create the most comprehensive and intuitive visual library of recreational scuba diving hand signals available today.

The project involved illustrating over 40 essential scuba hand signals used by divers of varying experience levels. These ranged from simple one-handed gestures like directional indicators (“left” and “right”), to more complex two-handed signals such as “boat,” and even signals requiring interaction with the torso or gear. The challenge wasn’t just accuracy—it was clarity, consistency, and usability across multiple real-world applications.

At the core of this project was anatomical precision. Each hand position was carefully constructed to reflect realistic human movement and proportion, ensuring that the gestures would be immediately recognizable to divers underwater. Unlike stylized or exaggerated graphics, these illustrations needed to mirror how signals are actually performed in real diving conditions—often while wearing gloves, managing buoyancy, and operating in low-visibility environments.

Another key consideration was consistency. With over 40 signals in the system, maintaining a unified visual language was critical. Every illustration follows the same perspective, lighting logic, line weight, and compositional framing. This consistency allows users to quickly scan and interpret signals without cognitive friction, which is especially important in time-sensitive or safety-related situations.

A major advantage of using technical illustration over photography became clear early in the process. While photographs can capture realism, they often introduce unnecessary complexity—background noise, lighting inconsistencies, and distracting details such as gear or environmental elements. In contrast, these illustrations strip away all non-essential information, focusing purely on the gesture itself. The result is a clean, high-contrast visual system that enhances recognition speed and reduces ambiguity.

These illustrations were also designed with versatility in mind. One of the primary use cases is small-form-factor reference cards that divers can carry with them. This required careful attention to scalability, ensuring that each signal remains legible and distinct even at reduced sizes. The simplified color palette and strong linework make the illustrations highly effective across print and digital formats, from laminated dive cards to mobile learning tools.

Perhaps most importantly, this project fills a gap in the diving community. Despite the widespread use of hand signals, there has not previously been a single, comprehensive, and consistently illustrated set that divers can rely on as a standard reference. The Dive Otter’s library now serves as both an educational tool for beginners and a quick-reference system for experienced divers.

This project highlights the power of technical illustration in high-stakes, real-world applications. By prioritizing clarity, consistency, and usability, illustration becomes more than just visual support—it becomes a critical communication tool.