were over the craft s unusual design. it s non spherical state, effectively, the reliability of the material it was made of, carbon fibre, and the fact that it also not answer any external, independent testing process. the bbc has been given a e mail exchange between stockton rush, the ceo of oceangate who died in the incident, and a leading deepwater explosion specialist. the e mails sent in 2018. rob mccallum warns stockton rush. he went on. a few days later, oceangate s stockton rush replied. he told rob mccallum. guillermo, the former co founder of oceangate. .. the next day, rob mccallum replied, in starkest terms, i think you are potentially placing yourself and your clients in a dangerous dynamic. right, let s get more on this right now. our science correspondent jonathan amos is standing by. this is quite a stark exchange of e mails? it this is quite a stark exchange of e-mails? , ,., , , , e-mails? it is polite but it is very testy. one e-mails? it is polite but it
them again and they say that they have no additional information. rob mccallum maintains no one should have gone in this submersible. so, that s the exchange that we have been given and seen exclusively here at the bbc. we will be getting plainmoor reaction to that a little later plenty more reaction to that. now, though, in the uk, a man has been found guilty of murdering a metropolitan police sergeant in a holding cell in croydon in south london. louis de zoysa s trial heard he used a revolver and handmade ammunition to kill matt ratana in september 2020. following the verdict, the police watchdog the independent office for police conduct called for hand held metal detectors to be introduced widely in policing across england and wales. the case was heard at northampton crown court. our correspondent frances read is there for us now. yes, it was back in september 2020