When audiences watch breathtaking underwater footage on screen, they naturally think of the director, cinematographer, and actors working behind the scenes — but there is one more critical role that often goes unnoticed. These individuals are responsible for protecting the director and actors throughout the shoot, and even serve as the central coordinator for the entire underwater crew: the underwater safety diver.
Underwater shooting involves far more variables than land-based production, with a much wider range of uncontrollable factors. Unlike on land, adjustments cannot be communicated directly on the fly. This means the role of the underwater safety diver goes well beyond simple surveillance and protection. Most people instinctively equate underwater safety divers with lifeguards, and don't consider them a core part of the crew — productions often hire any available recreational diver to fill the role. But this approach quietly increases shooting risks and communication costs. Director Yuan Xu-Hu (referred to below as Director Hu), the driving force behind "海人制作" (Taiwan Underwater Production) — Taiwan's only professional underwater film production team — draws on years of experience to share with us just how important the underwater safety diver truly is.
Behind-the-scenes moments of Director Yuan Xu-Hu and his team's underwater safety work during a shoot
Underwater Safety Divers Are Not Lifeguards — They're the Connective Tissue of the Entire Crew
Director Hu requires that safety divers on the 海人制作 team be involved in production planning from the very beginning. They must know every step of the shooting schedule and the full crew roster, and be able to track the status of the people they are responsible for during every scene transition. This is a fundamental difference from the common practice of hiring any available diver — or even a lifeguard — as a safety diver. Safety divers are divided into two types: scuba safety divers, who are primarily responsible for the underwater cinematographer, and freediving safety divers, who are primarily responsible for the actors being filmed.
The Scuba Safety Diver: A Powerful Upgrade for the Underwater Cinematographer
During a shoot, the underwater cinematographer may become so focused on framing the shot that they lose awareness of their surroundings — for instance, getting stung by a sea urchin or bumping into a reef while repositioning. The safety diver must remain constantly alert and proactively eliminate hazards before they become a problem.
When an underwater cinematographer is hand-holding a camera rig weighing anywhere from 20 to 40 kg, their neutral buoyancy is easily disrupted, making it difficult to maintain the ideal depth. This not only increases risk but also makes it harder to achieve the desired composition and camera angle. In these moments, the safety diver becomes the cinematographer's personal stabilizer, helping them fine-tune their neutral buoyancy to the ideal position.
The scuba safety diver must stay attuned to the underwater cinematographer's needs at all times and provide immediate support
Director Hu recalled a dive near the Lingyun wreck close to Penghu's South Penghu Marine National Park, where the team missed the descent point and then encountered a sudden current shift. The cinematographer, struggling against enormous water resistance while holding the camera, was unable to reach the shooting location. The safety diver had to step in and help push against the current together to reach the rendezvous point.
Sometimes, due to weather conditions or time-sensitive shooting requirements — such as capturing the underwater rays of light at dusk — the cinematographer will opt for a sidemount configuration with multiple cylinders to extend bottom time, making decompression stops an inevitability. In these cases, the safety diver may ascend to the surface to retrieve decompression cylinders for the cinematographer below, or carry them directly (one safety diver has carried as many as five cylinders at once), making the cinematographer's underwater work considerably more manageable.
At the 願你擁有大海的靈魂 (May You Have the Soul of the Sea) exhibition, Coach Wei-Zhe, who primarily serves as a scuba safety diver, shared that his main task is to stay with the cinematographer at all times — monitoring the surrounding environment, keeping an eye on the cinematographer's equipment and pressure gauge (SPG), anticipating the cinematographer's needs, and upholding the team's cardinal rule: safety first, no unnecessary high-risk attempts.
The Freediving Safety Diver: The Actor's Eyes and Feet
Coach Zheng-Feng explained that the freediving safety diver's role is to be the actor's eyes and feet. Most actors film without a mask, and even with eyes open underwater, the difference in water's refractive index makes it impossible for them to focus clearly. Before each dive, the freediving safety diver must communicate with the actor on the surface — conveying the intended camera angle, direction, and expression for the upcoming shot — then guide the actor to the exact shooting position once they descend. This means the freediving safety diver must have the storyboard and every camera angle committed to memory, ensuring the shoot proceeds smoothly.
The freediving safety diver's job is to guide the actor into the correct position
In addition, a skilled freediving safety diver must continuously monitor the actor's condition throughout the shoot. As the number of dives accumulates, actors grow physically fatigued and their breath-hold times inevitably shorten. The safety diver must read these signs in real time and communicate them to the crew, ensuring the actor gets adequate rest when needed.
Of course, freediving and scuba safety divers also work in tandem. For example, if a storyboard sequence calls for showing the actor swimming forward, the scuba safety diver may be positioned ahead to provide lighting, while the freediving safety diver signals to the actor at the surface before guiding them underwater toward the light source to complete the shot.
Underwater production, much like any land-based film crew, requires every storyboard frame and blocking movement to be thoroughly discussed and rehearsed beforehand. In the water, all of this communication happens in silence, through hand signals. Director, cinematographer, actor, and safety diver each play their own distinct role beneath the surface — and together, the entire crew performs like a symphony orchestra, delivering a flawless concerto to the audience above.
Underwater filmmaking is a perfect symphony of different roles working in harmony
Yuan Xu-Hu: A great underwater safety diver needs not only exceptional diving skills, but also a heightened awareness of everything happening around them.
The minimum qualification for a safety diver on the 海人制作 team is a dive instructor with teaching experience. Instructor-level certification provides the fundamental diving competency and safety awareness required for the role, while hands-on teaching experience gives them a deeper understanding of what a cinematographer or actor needs underwater. When verbal communication is impossible during a shoot, the safety diver must be able to read an actor's facial expressions and eyes to assess their physical condition, respond to sudden changes in the environment, and coordinate the crew to make the safest and most efficient adjustments on the fly — an indispensable contribution that deserves far greater recognition.
海人制作 is Taiwan's first and only professional underwater film production team. We look forward to seeing many more stunning underwater productions from this Taiwanese team through their lens!
The 海人制作 team's 2022 winter training camp at Xiaoliuqiu
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