A Bathosphere and a diving bell. The first deep sea exploring vessels were in the shape of a bell and were open on the bottom just like a bell. They weren't able to go as low as we can now because there was no protection from increased pressure. They were lowered into the sea by a cable and had fresh air pumped into it. There was also a radio line so the people inside could talk to the people on the ship.
bathysphere
barge maybe
Bear starts with the letter B
Belgium is a country that starts with B.
The chicken that starts with B is bantam.
P.B. "B" is the give way vessel to P.B. "B" who is the stand on vessel. "A" must not impede "B".
A bumper sticker is sticky. It starts with the letter b.
a BMW starts with the letter b!!
Baclofen is a muscle relaxer that starts with the letter B
The word 'boom' can be used as a word for explosion that starts with a b.
B. Booth has written: 'Exploring the linearity of the climate response to external forcing'
The state Bihar in India starts with B!
Boost is a synonym for the word lift and starts with the letter B.