Bib wrote:

I've had excellent results with ones made by Steiner, a German company.
Rather pricey but incredible optics and waterproof.

I couldn't find information on whether they were also submersible, but
upon writing to the company, the 8x30 Navigator binoculars are rated for
a depth of 15 feet for 45 minutes and can withstand a temperature change
of 70 degrees with no fogging. (I am guessing this is going to be true
of their other waterproof binoculars as well.)

Pretty amazing specs.

Prior to this, I could only find submersible binoculars that were rated
to a depth of 1 meter for 5 minutes.