RIP Harry Goz
“Harry Goz, the voice of Captain Murphy, passed away this week. A message from Adam Reed and Matt Thompson, co-creators of “Sealab 2021,” follows:

“We are devastated by the loss of our good friend, Harry Goz. Working with him was always sheer joy, and his talent was beyond compare. Our thoughts and prayers are with his family, and we shall all miss him dearly.” “

Another post by an editor of the show mentions that he succumbed to cancer.

No word just yet on how/if Sealab continues, but a replacement actor would not likely be well-received by the show’s fans.
Sources for information here and here and here.