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The beetle larvae are very peculiar and quite different from those of the Dytiscidae. Despite diligent searching, I haven't found any myself, so far. I was grateful that Mrs. E. Stegeman-Broos allowed me to use a few photos to supplement the story about this beetle on the website.
Among the beautiful beetle larvae drawings by Schiødte (1861), there are several of the Squeak beetle, these can be found under "PELOBIUS HERMANNI F.". Some of them are on this website. The leftmost drawing depicts the newly hatched Hygrobia larva, which in reality is, of course, (much) smaller than the fully grown larva in the drawing to the right.
The young larva apparently has a relatively large head; I hope to see that upon a time. The older larva is aptly drawn, as is the side-view drawing below; see the photos.
Balfour-Browne (1922) also made some fine drawings of the larva, including a number of top-down views, showing the difference in colour intensity of the spots.
Below is Schiødte's (1861) drawing of the adult larva seen from the side. I've rotated it so it's roughly horizontal. This clearly shows that it's a fairly lifelike sketch. The three gill appendages on the tail are drawn to be the same length, but in the photo we see two shorter ones and one longer one.
Literature: See the list on the first page.
Dutch page