. >> among the missing, trustee for the mountain-based search for mountain terrestrial and turgeon's. shahzada dawood is the vice chair of one of pakistan's largest conglomerates. is 19-year-old son suleman dawood is also on board. the others on board are the ceo of oceangate expeditions, a british billionaire and a french titanic expert who has been to the wreck more than 35 times. >> submersibles have been used to explore the ocean floor for decades. katie nielsen talked with a bay area man who was a pioneer in the field for some insight about the situation unfolding there. >> at this part of our human nature, curiosity. >> reporter: don walsh is 91 years old now but in 1960, he ended french engineer for the first two people to ever explore challenger deep in a submersible, diving more than seven miles down to the floor of the pacific ocean. >> that was my job, a test pilot. not to do science but to make sure it was safe and reliable before we handed it over to the scientists. >> reporter: since then, walsh made a career out of submersibles and became a pioneer in the field. he said

colin: turgeon, yes you are seeing length but maybe look for values elevated for what does the worldanting ever cleaner energy. we think it needs all of those three things together. one of the things that plays into that is that gas is a reliable source of energy and it is one that has some of the lowest emissions of fossil fuels. we think that plays. your has got to bounce -- europe has got to balance these things. we observed early in the crisis that there was a bit of dichotomy with people not necessarily wanting to commit for a long period of time because they worried about speed of energy transition. what we have seen in the last year is more and more european counterparts opening up to a longer term forecast contracts, because they realize that gas is part of energy -- longer-term for gas contracts. guy: 10 years plus, does that suggest that the mindset has shifted, at the policy level or corporate level, in your nest in europe? colin: is your question directly, yes. one of the things i often described is that although we talk about europe, europe is the mix of different compan

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