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had a semicircle of large stones round a 31
research carried out into structures, 32 and human remains
used in the oil industry, e.g. to make 33
problems: they were expensive and 34
Marzamemi, Sicily: found ancient Roman ships carrying architectural elements made of 35
36 is used for short distance communication, acoustic waves for long distance
AUV can send data to another AUV that has better 37 ,for example
one carrying 38 supplies;
tablets may have been used for cleaning the 39
others carrying containers of olive oil or 40