It is thought they may have propelled themselves with their forelimbs, dragging their hindquarters in a similar manner to that used by the elephant seal.
ɪɾ ɪz θˈɔːt ðeɪ mˌeɪhɐv pɹəpˈɛld ðɛmsˈɛlvz wɪð ðɛɹ fˈɔːɹlɪmz, dɹˈæɡɪŋ ðɛɹ hˈaɪndkwɔːɹɾɚz ɪn ɐ sˈɪmɪlɚ mˈænɚ tə ðæt jˈuːzd baɪ ðɪ ˈɛlɪfənt sˈiːl.