in an email sent in 2018, rob maccallum warned stockton rush: i have given everyone the same honest adviceuntil a sub is classed, tested and proven, it should not be used for commercial deep dive operations. he went on, as much as i appreciate entrepreneurship and innovation, you are potentially putting an entire industry at risk, so i implore you to take every care in your testing and sea trials and to be very, very conservative. a few days later, stockton rush replied. he told rob mccallum, i've grown tired of industry players who try to use the safety argument to stop innovation and new entrants from entering the small existing market. since the formerfounder small existing market. since the former founder of oceangate and i started ocean gates, we heard the baseless cries of you are going to kill someone way too often. i take this as serious personal insult. the next day, rob mccallum replied in the starkest terms. i think you are potentially placing yourself and your clients in a dangerous dynamic. ironically, in your race to titanic, you are mirroring that famous cry, she is unsinkab

in an email sent in 2018, rob maccallum warned stockton rush... he went on...ays later, oceangate's stockton rush replied... he told rob mccullum... the next day, rob mccallum replied in the starkest terms... oceangate's lawyers then contacted rob maccullum and threatened legal action. today, we've contacted them again and they say they have no additional information. rob mccallum maintains that no one should have gone in this submersible. our science correspondent jonathan amos has been tracking this story since the sub was first reported missing. this is a stark exchange your? it's a this is a stark exchange your? it�*s a fascinating exchange, actually. it is polite —ish, but it's also very testy indeed. we should perhaps explain who rob mccullum is, he's got a storied career in deep submersibles. he led the five deeps expedition — so this was the american adventure of the first person ever to reach the deepest points and all the world's oceans. so he certainly knows what he's talking about. and his criticism of stockton rush here, the ceo of oceangate, centr

in an email sent in 2018, rob maccallum warned stockton rush? he went on... stockton rush replied... the next day, rob mccallum replied in the starkest terms: oceangate's lawyers then contacted rob maccullum and threatened legal action. today, we ve contacted them again and they say they have no additional information. rob mccallum maintains that no—one should have gone in this submersible. this morning, we heard from william kohnen, chairman of the us marine technology society, manned underwater vehicles committee. in 2018, he and other engineers wrote a letter to stockton rush warning of the dangers of using an uncertified craft. this was clearly preventable and we do have regulations and the issue is as an industry, we make submersibles and making submersibles here in los angeles for 30 years and some the best submarines in the world and there is order in their ways to be clever and go around things and for sure, it needs to be clear that he submersible like this and with the redoing for tourism would not be allowed in us waters and the coastguard would no

in an email sent in 2018, rob maccallum warned stockton rush... he went on to say... ys later, oceangate's stockton rush replied... he told rob mccallum... the next day, rob mccallum replied in the starkest terms... oceangate's lawyers then contacted rob mccallum and threatened legal action. today, we've contacted them again and they say they have no additional information. rob mccallum maintains that no—one should have gone in this submersible. no—one should have gone let's get more on this from carl nasman, our correspondent in boston, where the search was coordinated. over to you, carl. family members today have — over to you, carl. family members today have called _ over to you, carl. family members today have called for _ over to you, carl. family members today have called for a _ over to you, carl. family members today have called for a full - today have called for a full investigation into exactly what happened on that titan submersible post up these are family members of one of the british passengers on board. meanwhile, today, recovery efforts continue. about