One of the first in this field was open ROV, a group that uses Linux computers and Kick starter funding to develop their submersibles. Led by NASA engineer Eric Stack-pole, the group launched a 5 lb. consumer/educational ROV the size of a laptop in kit form for just $900 in 2012. Their latest model. shipping in November, is the Trident. This sub is small enough to fit in a rucksack under an airplane seat. trident's