I often see dive and delve used almost interchangeably when writing about exploring a topic. For me, though, the words' meanings are not interchangeable.
First, there is dive. If a person or group is diving into a topic, they are entering into it. Dive was derived from a word that means "to dip."
Second, there is delve. If a person or a group is delving into a topic, they are digging deeper into it. Delve was derived from a word that means "to dig."
So, for instance, if a legislative body is meeting to discuss a topic for the first time, it is diving into the topic. If, however, it meets repeatedly to discuss a topic, it is delving into that topic.
Go ahead and delve into the meaning of the sentence when dive and delve come up.