he told rob mccullum... the next day, rob mccallum replied in the starkest terms...te'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, centres around the approach of stockton rush�*s company, the materials they are using in the titan sub, but also around this lack of a certifica

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