I am sure any modern brainwashed scietist on board of the RRS Discovery hate whaling. And its not clear which ship it was https://en.wikipedia.org/wiki/RRS_Discovery

https://en.wikipedia.org/wiki/RRS_Discovery_II

https://en.wikipedia.org/wiki/RRS_Discovery_(1962)

https://en.wikipedia.org/wiki/RRS_Discovery_(2012)

https://auctionet.com/de/3272312-forschungsschiff-pfeile-zum-markieren-von-walen

darts for marking whales, I think shot from common single shot gun.

a .410 and 12 ga dart to shot into a whale for scientific research. the long .410 plastic shell point to the 1962 build ship. the 12 ga brass case made probably by Eley(?) except the newest ship with this name. don't believe they shot a whale a dart into the blubber anymore for scientific fun.

the japanese were more consequent when shooting on whale for scientific research with a 75 mm caliber: