Updated September 30, 2026: When we first published this page on August 30, the iPhone 18 Pro had not been announced, and our honest answer was that testing was still in progress. Apple has since released the phones, DIVEVOLK has launched its sixth-generation SeaTouch 6 Pro housing, and the answer below is now confirmed. If you dive with a SeaTouch 4 Max Plus, check the compatibility sheet on our technical support page before ordering an adapter.
Apple unveiled the iPhone 18 Pro and iPhone 18 Pro Max at its September 9 event, and both phones have been in stores since September 18. Our inbox filled with the same question divers ask us every September: "Can I take it diving?"
The answer is yes. The SeaTouch 6 Pro, DIVEVOLK's sixth-generation full-touchscreen underwater housing, accepts both iPhone 18 Pro models, and iPhone 18 production units have been checked against its internal cavity. You seal the phone in with the phone-specific adapter for your model, and the whole touchscreen, with every on-screen camera setting in Apple's Camera app, comes with you to 60 meters.
We have answered this question on launch day before, when the iPhone 17 series landed last year, and the reason the answer comes quickly is the same: a SeaTouch housing is designed around a phone envelope, not a single phone. Here is what fits, why it fits, and what the new camera hardware changes 20 meters down.
1. Compatibility at a Glance
| Phone | SeaTouch 6 Pro | What you need |
|---|---|---|
| iPhone 18 Pro | Compatible | Phone-specific adapter for iPhone 18 Pro |
| iPhone 18 Pro Max | Compatible | Phone-specific adapter for iPhone 18 Pro Max |
Model-by-model fit notes for the SeaTouch series live in the DIVEVOLK public compatibility sheet. Bookmark it before you order.
One model is deliberately absent: the SeaTouch 6 Pro does not support Apple's foldable iPhone Duo. Closed, it measures 84.1 mm wide and 11.3 mm thick according to Apple's iPhone Duo specs, just outside the housing's phone envelope, and a hinge, two panels and a crease change sealing, membrane contact and camera geometry at once.
2. Why the Fit Was Never in Doubt
The SeaTouch 6 Pro was never built around one phone. It is specified by an envelope: a phone body up to 180.0 x 82.5 x 11.2 mm, with a camera bump up to 17 mm. Anything inside those numbers fits, and phone-specific 3D-printed adapters position each model precisely between the optical port and the touch membrane. That same cavity already covers iPhone 6 through the iPhone 18 series.
| Measurement | iPhone 18 Pro (Apple) | iPhone 18 Pro Max (Apple) | SeaTouch 6 Pro limit |
|---|---|---|---|
| Height | 150.0 mm | 163.4 mm | 180.0 mm |
| Width | 71.9 mm | 78.0 mm | 82.5 mm |
| Body thickness | 8.75 mm | 8.75 mm | 11.2 mm |
| Camera bump | Not listed by Apple | Not listed by Apple | 17 mm |
The iPhone 18 columns come from Apple's published iPhone 18 Pro tech specs. Apple does not publish a thickness figure that includes the camera plateau, which is exactly why we checked production units in the cavity rather than relying on a spec sheet for the one number that has to clear the optical window.
On every published axis the margin is generous: more than 16 mm of spare height and 4.5 mm of spare width even on the Pro Max, and close to 2.5 mm of spare body thickness on both models. The larger Pro Max is still nowhere near the edge of a 180 x 82.5 mm cavity.
3. What the SeaTouch 6 Pro Brings to Your iPhone 18
| SeaTouch 6 Pro | |
|---|---|
| Depth rating | IPX8 to 60 m / 200 ft, triple seal, button-free body |
| Touch membrane | Sixth generation, rated to a 150,000-swipe durability standard (up 50% from 100,000) |
| Touch window | Restructured for a larger screen ratio; native edge swipe-up to the home screen works on large phones |
| Screen protector | Can stay on inside the housing |
| Phone envelope | Up to 180.0 x 82.5 x 11.2 mm, camera bump up to 17 mm |
| Materials | Engineered plastic housing, aluminum alloy protective frame, 316 stainless steel |
| In the box and built in | Snorkeling red filter for 0 to 10 m, desiccant slot, half-dome lens integration slot covering all lenses |
| Shutter mounting | Left or right side |
| Weight | 475 g on land, about 150 g in water |
Two of those rows matter more on an iPhone 18 than on any phone before it. The restructured touch window means the 6.9-inch Pro Max gets the native swipe-up to the home screen right at the edge of the display, so leaving the camera to check a dive computer app or a fish ID guide is one gesture, not a workaround. And because the membrane works with a screen protector installed, a brand-new phone does not have to lose its protector on day one. From there, the modular mount connects the housing to DIVEVOLK wet lenses and filters, lights and trays, so the rig can grow with the diving you do.
4. What iPhone 18 Pro's New Features Mean Underwater
A Variable Aperture on the Main Camera
Apple's headline camera change this year is a 48MP Fusion Main camera with a mechanical variable aperture on both Pro models, with four settings: ƒ/1.48, ƒ/1.8, ƒ/2.8 and ƒ/4.0. Underwater that cuts both ways usefully: open it up in the blue or inside a wreck and you claw back light without pushing ISO; stop down to ƒ/2.8 or ƒ/4.0 on a macro subject and you get depth of field where a phone normally gives a paper-thin sliver of focus. Apple lets you set the aperture in the Camera app and in its on-screen Pro controls, which is exactly the kind of fine adjustment a full touchscreen housing is built for.
A New Main Camera Sensor
Apple describes a new main sensor that improves image quality, with better low-light photography and crisper detail. Both help in the situation phones have always struggled with, a dark reef wall in the foreground and a bright surface behind it. Add a video light and you stop choosing between a blown-out water column and a black subject.
Up to 45 Hours of Video Playback on the Pro Max
Apple rates the Pro Max at up to 45 hours of video playback and the Pro at up to 36 hours, with new battery designs and an even larger battery in eSIM-only models. For divers that is not an abstract spec: screen brightness is the biggest drain in a housing, because you run it high to see the frame through a mask. More endurance means the phone can stay sealed from the morning boat to the last dive, instead of opening the housing on a wet, rolling deck to charge.
The 2 nm A20 Pro Chip and a Bigger Vapor Chamber
According to Apple's announcement, the A20 Pro is built on a 2-nanometer process and pairs with a next-generation vapor chamber for higher sustained performance. Sustained high-bitrate 4K is a thermal and compute problem inside a sealed housing, and a more efficient chip with better heat spreading does that work with less throttling. It also shortens the part nobody enjoys, grading and exporting a dive's worth of footage.
Dual Capture, Started From the Screen
Dual Capture records the rear and front cameras at the same time, up to 4K Dolby Vision at 30 fps on the Pro Max. Underwater, that means the reef or the turtle in one frame and your own reaction in the other, from a single take. Starting it and moving the picture-in-picture window are touch actions, so they work through the housing membrane like everything else.
Satellite Features, at the Surface
Apple lists Emergency SOS, Messages, Find My and Roadside Assistance via satellite for the iPhone 18 Pro models, in supported regions. These are surface capabilities, not underwater ones, and they belong in your safety planning rather than your camera planning. At the surface the iPhone's GPS and cellular signals pass through the SeaTouch 6 Pro, so a housed phone is still a working phone the moment your head is above water, which is exactly how John reached help off Saba after drifting from his boat.
The Same 6.3 and 6.9 Inch Displays
Screen sizes are unchanged at 6.3 and 6.9 inches, which is quietly good news: your framing habits carry over. The Pro Max remains the largest viewfinder you can take underwater without a monitor.
5. Six Touchscreen Moves to Learn Before Your First Dive
Everything below is done with a fingertip on the screen, so all of it works through the housing membrane. Practice dry at home, then in a pool, and it will be muscle memory by your first dive.
- Slide the zoom dial instead of pinching. Pinch gestures are clumsy in cold water. Press and hold the zoom number until the dial appears, then drag along it for a smooth, controllable change of framing.
- Lock focus and exposure with a long press. Press and hold on your subject until AE/AF LOCK appears. A trevally swimming toward you no longer pulls focus onto the blue behind it.
- Drag the exposure slider down for black backgrounds. Tap to focus on a nudibranch, then pull the sun icon down hard. With a tightly aimed light, the water behind the subject goes black.
- Swipe the on-screen shutter left for a burst. Hold and drag left and the camera fires continuously. This is how you keep a usable frame of a fast, unpredictable animal.
- Swipe the on-screen shutter right to start video. Something worth filming always appears while you are in photo mode. Drag right and recording starts immediately, with no mode switching.
- Tap the white circle while filming for a full-resolution still. A tap saves a real photo rather than a video grab, and the recording never stops.
6. The Buttons You Can't Reach (and Why That's Fine)
Be clear on this before you dive, because it shapes how you shoot. The SeaTouch 6 Pro is a button-free design. Once the iPhone 18 Pro is sealed in, its Camera Control, its volume keys and its side button cannot be pressed, and no physical control on the phone body is reachable underwater; every shot is taken through the touchscreen. Anything Apple assigns to Camera Control, you do on screen instead. Your finger presses the membrane, the membrane presses the screen, and you drive Apple's camera app exactly as you do on land.
That is the point of the design, not a compromise inside it. You are not locked into a housing maker's simplified control set: aperture, focus, exposure, zoom, modes, playback, third-party apps and dive logs are all yours at depth.
If you want a tactile trigger, because you dive in 5 mm gloves or hold the housing away from your face, the answer is the DIVEVOLK Underwater External Shutter. It pairs with the phone over Bluetooth 5.4, is rated to 60 meters, mounts on the left or right of the SeaTouch 6 Pro, and gives you a real click without asking you to reach anything on the phone itself.
7. IP68 Is Not a Dive Rating
Every September this needs saying again. Apple rates the iPhone 18 Pro and Pro Max IP68 to a maximum depth of 6 meters for up to 30 minutes, and its liquid-resistance guidance describes those as static lab conditions, warns against swimming with an iPhone or intentionally submerging one, and states plainly that liquid damage is not covered under warranty.
That is not a dive rating. It is a splash-and-accident rating and it does not add to a housing's depth rating: 6 meters of phone plus 60 meters of housing is not a 66 meter system. The housing takes you to depth; the phone rating saves you when a wave catches you on the dock.
8. Before You Seal the Housing
- Your screen protector can stay on. The sixth-generation membrane is designed to work with a screen protector installed, so a new iPhone 18 does not need to be stripped before it goes in.
- Take the phone case off. The phone goes into the adapter bare. Cases change thickness and seating, and the adapter is dimensioned for the phone itself.
- Seat the phone in the correct adapter. The adapter for your iPhone 18 model positions the camera module over the port and holds the phone flat against the membrane. Check the cameras sit centered in the window before closing anything.
- Load a fresh desiccant pack. The SeaTouch 6 Pro has a built-in desiccant slot; a fresh pack before each dive keeps the lens glass clear when the water is much colder than the air.
- Do a freshwater soak test. Close the empty housing, sink it for a few minutes, then open it and check for water. Do this before every trip.
- Watch the heat. Long recordings inside a sealed housing are their own thermal environment; Apple's temperature-management guidance explains what an iPhone does when it warms up. Never leave a loaded housing baking on a boat deck.
- Confirm your row in the compatibility sheet and keep the technical support hub handy for manuals and downloads.
Ready to Dive With iPhone 18?
If you are building your first underwater setup alongside the new phone, start with the SeaTouch 6 Pro and the adapter for your iPhone 18 model, then add the lenses and lights most divers reach for within a season. You can browse every DIVEVOLK housing and adapter in one place.
Still deciding how to build the rig around it? Reach out through technical support for a second opinion on lenses, lights and mounting for the diving you actually do. The new phone is ready. So is the housing.
