You heard a "k" consonant arhh, waaaah, i didn't
!
Almost there. What is heard my me is " tam
tsui hai uaᴺ " (the floating "n" -
ᴺ is symbol for nasalisation) or even "
tam tsui hai ua " (without nasalization -
the nasalization is weak).
Anyway, the main point here is not the nasalization
thingy, but the loss of the initial consonant
"h" in "岸" from the standard accepted
" huaᴺ ", as in "海岸" "
hai huaᴺ ".
Definitely not "hai arm" laa ... 
so it is " hai hua" hhahahah, I don't know which
sound.
