A vessel capable of operating or remaining under water. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "submersible" in a sentence
"He also said the Jiaolong's designers had purchased a lot of "off the shelf" technology from overseas, and had benefited from training dives on the U.S. Navy's Alvin manned submersible, which is operated by the Woods Hole Oceanographic Institution in Massachusetts."
"Video from a robotic submersible, which is making the rounds online, shows something puffing from the seafloor."
"Very dorky looking - I much prefer the look of that biomimetic dolphin submersible."