What are the connotations of "Natisa Yemincha"?
Rashi: Everything lies in the Hands of Hakadosh-Baruch-Hu; He has only to bend it and they fall. 1
Seeing as the Egyptians died in the sea, why did the earth swallow them?
Rashi and Ramban #2 (both citing the Mechilta): From here we learn that they merited burial - because they proclaimed "Hashem ha'Tzadik!" 1
Targum Yonasan: The earth and the sea were quarreling over who should take in the Egyptian corpses; The sea told the land to accept its earthlings, whereas the land maintained that since the sea killed them, the onus lay on it to accept them. So Hashem stretched out His hand and swore that the land would not be taken to task 4 ... , and the land duly accepted them.
Rosh: Because they engaged in the burial of Yakov, they merited burial, Midah k'Neged Midah. Hashem does not deny the reward of any creature!
See Bereishis 9:27 (Rashi). Hence the Pasuk writes "Natisa Yemincha" - to kill them in the sea; "Tivla'eimo Aretz" - the earth took in their corpses - the burial that they merited (Ramban).
Ramban: As the Pasuk indicated above (14:30).
On the great day of judgment, as it was taken to task for accepting the corpse of Kayin (Targum Yonasan).