I found a description by someone who used a Seaway on a tuna.
historian
Jun '09
This is funny!
I used this round and device in Tuamotu Ilds, Tahiti, september 1978!
By the way, a guy from some Jap TV channel wanted a demo and we took him with us in the boat, but, instead of sharks, we did kill a nice yellow tuna...-ca. 25 kg...)
Results were impressive, a deep hole in flank, approx. 25 cm wide...
So we had a fresh shashimi aboard!
It must be said that, maybe was it a bad lot, only three out of 10 rounds did function properly, other did misfire (lack of water tightness?)
I stil have one of the misfired rounds in my drawers, it is the one which is pictured in ECRA 's ECDV program.
Cheers
Philippe