We have tested and approved the ASF-1 mkII for depths up to 100 meters.
The ASF-1 mkII comes with a 10 m cable, so if you would like to record in higher depths, you need to acquire a longer cable. We offer cables with 10 m, 20 m, 50 m and 100 m in our shop and we can manufacture custom lengths up to 100 meters upon request.
The ASF-2 mkII can be used up to a depth of 10 meters, limited by its non-detachable 10 m XLR cable.