Translation:Is there light at the bottom of the ocean?
Sometimes it is spelled as "samudera", but all of native speakers on HiNative prefer "samudra". One of them even doesn't approve "samudera". https://hinative.com/questions/17807163
Like KBBI, one of my other dictionaries also redirects "samudera" to "samudra". I think the Duolingo course should be in line with dictionaries and inputs from native speakers.