“Chasing M2 or FIFISH V6?” is one of the questions underwater pilots in the advanced class ask most often. The problem: both names now stand for whole families. Before we compare, we therefore clarify which variants actually exist.
Important up front: we have not had either of these drones in the water ourselves. The basis is the official manufacturer data, the manufacturers' shops and the grading scheme of our ranking. This is an assessment, not a hands-on test.
- The fair comparison today: Chasing M2 S against FIFISH V6 Expert. Both are the current successors, and both dive down to 100 m according to the manufacturers.
- In our ranking, the V6 Expert is in first place with a grade of 1.5, and the M2 S in third place with a grade of 1.9.
- According to the manufacturer, the V6 Expert has more light (6,000 lumens), the larger battery (14,400 mAh, up to 5 h) and an optional shore power supply.
- According to the manufacturer, the M2 S has eight thrusters and a replaceable battery. The most expensive package includes a second 200 Wh battery.
- Prices (without guarantee, as of October 2026): V6 Expert from €2,899 plus VAT in the QYSEA shop Germany (around €3,450 with 19% VAT), M2 S from €2,799 including VAT from the German Chasing distributor.
Which variants exist?
Chasing M2 family
- M2: the original model. The data sheet is still online, but the M2 no longer appears on the overview page of Chasing underwater drones.
- M2 S: the current successor, listed in the Chasing shop with three packages.
- M2 Pro and M2 Pro Max: the industrial variants. For the M2 Pro Max, Chasing quotes 200 m depth, a 300 Wh battery and a weight of around 8 kg. That is a different league, in price too.
FIFISH V6 family
- V6: the original model. It is still listed in the German QYSEA shop, from €1,499.
- V6S: an older variant. It is no longer in QYSEA's navigation, but according to QYSEA its accessories fit the V6 Expert.
- V6 Expert: the current new edition. On the QYSEA website, only the V-EVO and V6 Expert remain as sport ROVs.
Our comparison therefore pits the two current models against each other: M2 S and V6 Expert. If you are looking for the original models second-hand, you will find the data for the M2 and V6 further down.
Manufacturer data side by side
| Chasing M2 S | FIFISH V6 Expert | |
|---|---|---|
| Dive depth | 100 m | 100 m |
| Camera | 1/2.3" CMOS, 12 MP, f/2.8, 150° | 1/2.3" sensor, 12 MP, f/2.5, 166° |
| Video | 4K at 25/30 fps, Full HD up to 120 fps | 4K at 30 fps |
| Slow motion | 720p at 240 fps, Full HD at 120 fps | 240 fps |
| Photos | JPEG and DNG (RAW) | also DNG (RAW) |
| Light | 2 × 2,000 lumens (4,000 in total) | 6,000 lumens in total (2 × 3,000) |
| Battery | 97.68 Wh, replaceable | 14,400 mAh, built in |
| Runtime | up to 4 h | up to 5 h |
| Charging | Drone 4.5 h | approx. 1 h to 90% |
| Shore power supply | no information found for the M2 S | optional (OPSS, MP200 package) |
| Thrusters / movement | 8 vector thrusters, 360° | 6 degrees of freedom, movement in all directions, attitude and depth hold |
| Top speed | no information in the M2 S data sheet | 3 knots (1.5 m/s) |
| Operating radius | 400 m | no information found |
| Weight | 4.5 kg | 4.6 kg |
| Size | 380 × 267 × 165 mm | 383 × 331 × 143 mm |
| Tether | 100 m (Lite) or 200 m (Standard, Advanced) | 100 m (M100, M100A) or 200 m (M200, M200A) |
| Storage | 64 GB | 128 GB, replaceable from the outside |
| Operating temperature | −10 to 45 °C | no information found |
| Accessories | Gripper arm, metal detector, Distance Lock sonar, laser scale, action cam | Q-IF interface with over 20 tools: gripper arm, 2D sonar, laser scale, sensors, positioning and more |
| Price DE / AT | from €2,799 incl. 19% VAT (Echolotzentrum, Lite with 100 m); Chasing shop USA from US$2,499 excl. tax | from €2,899 excl. VAT (approx. €3,450 with 19%, approx. €3,480 with 20%) |
| Price CH | from US$2,499 (converted approx. CHF 2,060, excl. tax and customs duty) | from CHF 3,050 incl. VAT (M100 set, tauchshop.ch) |
All information according to the manufacturers. Prices without guarantee, as of October 2026. Converted at the ECB reference rate of 16 October 2026 (€1 = US$1.1253 = CHF 0.9272).
The packages at a glance
Chasing M2 S (Chasing shop USA, prices in US dollars excl. sales tax; at the German Chasing distributor Echolotzentrum, Lite 100 m costs €2,799, Standard €3,699 and Advanced €4,299, each including VAT):
- Lite, US$2,499: drone, remote control, 100 m tether
- Standard Set, US$3,299: plus tether reel, 200 m tether, 2 spare motors, Flood Light 2 extra light
- Advanced Set, US$4,199: plus gripper claw, carry bag and a 200 Wh battery
FIFISH V6 Expert (QYSEA shop Germany, prices plus VAT):
- M100, €2,899: 100 m tether, foam box
- M200, €3,499: 200 m tether, industrial case
- M100A, €3,899: gripper arm, 100 m tether, industrial case
- M200A, €4,198: gripper arm, 200 m tether, industrial case
According to QYSEA, all packages include the drone, tether reel, remote control, VR headset and chargers. An MP200 package with the shore power system (OPSS) is described, but without a price.
Where the differences lie
Light and image: According to the manufacturer, the V6 Expert brings 6,000 lumens in total (two lamps of 3,000 each), the M2 S 4,000 in total (2 × 2,000). On paper the two cameras are close: the same sensor size, 12 megapixels, 4K at 30 frames per second and RAW photos. The M2 S also films Full HD at up to 120 frames, while the V6 Expert has the wider field of view.
Battery and runtime: Here two philosophies show. The V6 Expert relies on a large, built-in battery with fast charging and, optionally, power from shore. The M2 S has a smaller but replaceable battery. With a second battery in your bag, you are ready to go again after swapping, instead of waiting for the charger. According to Chasing, all runtime figures apply “depending on operating conditions”. What current, light and cold make a difference, we will clarify in our article on battery life in practice (planned).
Movement: According to the manufacturers, both move freely in all directions. Chasing quotes eight vector thrusters, QYSEA six degrees of freedom with attitude and depth hold (Posture Lock, Depth Lock). Whether the drones feel different cannot be read from data sheets.
Accessories: Both are accessory platforms. On the V6 Expert everything runs through the Q-IF interface with over 20 tools, up to water sensors and underwater positioning. According to Chasing, the M2 S covers the hobby classics: gripper arm, metal detector, sonar for keeping your distance, laser scale and action cam. What you need for treasure hunting is in our guide Treasure hunting underwater.
How the two rank in our ranking
The grades come from our ranking and are based on manufacturer data and our grading scheme. We do not award new grades here.
| Category (weight) | Chasing M2 S | FIFISH V6 Expert |
|---|---|---|
| Camera & image (30%) | 2.3 | 1.5 |
| Light (15%) | 2.4 | 1.0 |
| Depth & tether (15%) | 1.5 | 1.5 |
| Battery & runtime (15%) | 1.5 | 2.0 |
| Movement & control (15%) | 1.5 | 1.5 |
| Features & accessories (10%) | 1.5 | 1.8 |
| Overall grade | 1.9 good | 1.5 very good |
Interesting: on battery, the M2 S is ahead in our scheme, because the replaceable battery counts. On camera and light, the V6 Expert has the edge.
The original models: M2 and V6
If you want to buy second-hand, here are the manufacturer data for the first generation:
| Chasing M2 | FIFISH V6 | |
|---|---|---|
| Dive depth | 100 m | 100 m |
| Video | 4K at 30 fps, slow motion 240 fps (720p) | 4K at 30/25 fps, slow motion 240 fps |
| Light | 2 × 2,000 lumens | 4,000 lumens |
| Battery / runtime | 97.68 Wh, up to 4 h | 9,000 mAh, up to 4 h |
| Weight | 4.5 kg | 3.9 kg |
| Top speed | 1.5 m/s (3 knots) | 3 knots (1.5 m/s) |
| New price | no longer found in the Chasing shop | from €1,499 (QYSEA shop DE) |
What to look out for with used drones is covered in the guide Buying second-hand.
Which suits whom?
- You want to dive for a long time at a stretch, often in dark Alpine lakes: FIFISH V6 Expert. More light, a larger battery and, if needed, power from shore.
- You want several dives in a row without a charging break: Chasing M2 S. With a replaceable battery you swap on the shore and carry on.
- You plan measurements, sensors or positioning: FIFISH V6 Expert, because of the Q-IF interface.
- You want a gripper arm and a metal detector, but nothing more: both fit. Compare the package prices with gripper.
- You are in Switzerland: For the V6 Expert there is a Swiss franc price from the retailer. For the M2 S we found no Swiss retailer price, only the US dollar price in the Chasing shop.
- You mainly want to film: A class below may be enough for you. Take a look at the FIFISH V-EVO and the Chasing Gladius Mini S, or the brand comparison FIFISH vs Chasing.
You will find all the details on the Expert in the review FIFISH V6 Expert.
Practical tip to finish
Do not just calculate the price of the drone, but of the package you really need: tether length, gripper, case and, if applicable, a second battery. Only then will you see which of the two underwater drones works out cheaper for you.
Frequently asked questions
What is the difference between the Chasing M2 and the M2 S?
The M2 S is the current successor. According to the data sheet, both have 100 m depth, 4K video, 2 × 2,000 lumens and a 97.68 Wh battery. The M2 S is sold in the Chasing shop in three packages; the M2 no longer appears on the overview page.
Which drone has more light?
The FIFISH V6 Expert, with 6,000 lumens in total (2 × 3,000) according to the manufacturer. The Chasing M2 S has 2 × 2,000 lumens. The Flood Light 2 is also included in the M2 S Standard Set.
Can I swap the battery?
On the Chasing M2 S, yes, the battery is replaceable according to the manufacturer. On the V6 Expert it is built in, but there is an optional shore power supply (OPSS).
How deep do the two dive?
Both down to 100 m according to the manufacturers. Only the industrial variants manage more, such as the Chasing M2 Pro Max with 200 m.
What do the two cost in euros and Swiss francs?
The V6 Expert costs from €2,899 excl. VAT in the QYSEA shop Germany, so around €3,450 with 19% VAT. In Switzerland the M100 set costs CHF 3,050 incl. VAT from the retailer tauchshop.ch. The M2 S costs from US$2,499 excl. sales tax in the Chasing shop (USA), and from €2,799 incl. VAT from Echolotzentrum, the German Chasing distributor. All without guarantee, as of October 2026.
In the video
Both manufacturers present their current model themselves:
You can find reactions and comments on this article in the Unterwasserpilot forum (in German, English posts welcome): Unterwasserpilot forum
- Chasing, M2 S technical data (depth, camera, video, light, 97.68 Wh battery, runtime, charging time 4.5 h, weight, size, storage, operating temperature)
- Chasing, M2 S product overview (8 vector thrusters, 360°, replaceable battery, operating radius 400 m, 4,000 lm, accessories)
- Chasing shop, M2 S (Lite/Standard/Advanced packages, prices in US$, scope of delivery, 200 Wh battery)
- Chasing, M2 technical data (original model)
- Chasing, underwater drones overview (M2 no longer listed)
- Chasing, M2 Pro Max technical data (200 m, 300 Wh, approx. 8 kg, 2 × 4,000 lm)
- Chasing Forum, M2 Q&A (battery replaceable via additional battery compartments; 100 Wh battery charges in 2.5 h)
- Volatus Drones, C-SPSS shore power listed only for M2 Pro / M2 Pro Max
- QYSEA, FIFISH V6 Expert product page (camera, 240 fps, DNG, 90% in approx. 1 h, OPSS, 6 degrees of freedom, Q-IF accessories, 3 knots, 128 GB, navigation with V-EVO and V6 Expert as sport ROVs)
- QYSEA shop Germany, FIFISH V6 Expert (packages and prices plus VAT according to the shop, 14,400 mAh, up to 5 h, 4.6 kg, dimensions, scope of delivery, MP200, V6S accessories compatible)
- QYSEA shop Germany, FIFISH V6 (€1,499, 4,000 lm, 9,000 mAh, up to 4 h, 3.9 kg)
- Echolotzentrum, official Chasing distributor Germany (M2 S Lite €2,799, Standard €3,699, Advanced €4,299, incl. VAT)
- tauchshop.ch, FIFISH V6 Expert Set M100 (CHF 3,050 incl. VAT)
- ECB, euro reference rates of 16 October 2026 (USD 1.1253; CHF 0.9272)
- Unterwasserpilot, ranking (grades, sub-grades, CHF price V6 Expert)
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