You must be referring to European pirates who wanted to find India and started to discover new lands which they named 'NEW WORLD'. But humans migrated to different continents long time ago.
You must know how Aryans or now referring as Hindu were exactly from Asia Minor. Bangladeshi natives or ADIBASI were mixed of Austric and Dravid. Question is how did they migrated.
Humans evolved from 4 or 5 different regions but only Africans survived. Once due to famine only 25000 of them survived; human species was on the brink of extinction. Then they dispersed. When Ice Age came sea surface dried and became new lands which was bridge with continents. Thats how they migrated to Asia, Europe, America and obviously Australia. So now you got your answer on 'মানুষদের কোন গ্রুপ কি আরো আগে থেকেই মহাসাগর পাড়ি দিতে শিখেছিল?'
Here two image of human migration is given. The second one is made by mitochondrial DNA based analysis.