I see, I can't really differentiate character with quote-mark-like thing on it (what it's called again) >.>
Kana such as ボ (bo) and ベ (be) use the dakuon, which looks like quotation marks. ポ (Po) and ペ (pe) use the handakuon, which looks like a degree symbol.
Northern sea ocean depthsEmergency bulletin
Heavy snowfall in the ocean depths
Heavier than waterWowowo gabobe wowowo bebo wowo bebope wowowo wo bobebe wowowowo