▁International ▁Hel ic op ters , ▁from ▁P enz ance ▁H eli port ; ▁this ▁service ▁ceased ▁at ▁the ▁end ▁of ▁October ▁ 2 0 1 2 . ▁ ▁By ▁sea , ▁the ▁Is les ▁of ▁Sc illy ▁Ste am ship ▁Company ▁provides ▁a ▁passenger ▁and ▁cargo ▁service ▁from ▁P enz ance , ▁which ▁is ▁currently ▁operated ▁by ▁the ▁Sc illon ian ▁III ▁passenger ▁fer ry , ▁supported ▁by ▁the ▁G ry ▁Mar ith a ▁cargo ▁vessel . ▁The ▁other ▁islands ▁are ▁linked ▁to ▁St . ▁Mary ' s ▁by ▁a ▁network ▁of ▁inter - is land ▁launch es . ▁The ▁main ▁har bour ▁of ▁St ▁Mary ' s ▁( and ▁the ▁Is les ▁of ▁Sc illy ) ▁is ▁at ▁Hugh ▁Town , ▁and ▁is ▁called ▁St ▁Mary ' s ▁Har bour . ▁Further ▁s lip ways ▁and ▁small ▁qu ays ▁exist ▁around ▁the ▁island , ▁at ▁natural ▁har bour ▁sites , ▁such ▁as ▁at ▁Old ▁Town , ▁P end r ath en , ▁Wat erm ill ▁C ove , ▁and ▁P orth lo o . ▁ ▁R N LI ▁ ▁There ▁has ▁been ▁an ▁R N LI ▁lif eb o at ▁station ▁on ▁St ▁Mary ' s ▁since ▁ 1 8 3 7 . ▁The ▁first ▁two ▁lif eb o ats ▁were ▁kept ▁in ▁a ▁bo ath ouse ▁on ▁the ▁town ▁beach ▁at ▁Hugh ▁Town . ▁Following ▁closure ▁in ▁ 1 8 5 5 ▁the ▁lif eb o at ▁station ▁was ▁re - open ed ▁in ▁ 1 8 7 4 ▁and