Three individuals are scuba diving.
Drie mensen duiken.
Three people are currently scuba diving.
Momenteel duiken er drie mensen.
" Individuals " is interchangeable with " people ." If these people are scuba diving then you could say that they are currently scuba diving.
" Individuen " is uitwisselbaar met " mensen." Als deze mensen duiken dan kun je zeggen dat ze momenteel duiken.