B1
If you dive into water, you enter it headfirst with your arms held out above your head.
Dictionary examples:
My boss dived into the office fish tank to catch the escaping goldfish. (0.0)
The clumsy penguin dove into the pool, splashing water on all the sunbathers. (0.0)
My phone dived into the toilet as I reached for the soap. Oops! (0.0)
Mark dived off the bridge into the river. (33.4)
They ran to the pool, dove in, and swam to the other side. (53.4)
Look at those children diving for oysters over there! (54.9)