ML-18 (motor launch boat)
ML-18 was a British motor launch boat that disappeared in the North Sea while on passage from Norway.

Construction 
ML-18 was constructed in 1915 by the Electric Launch Company. She was completed in 1915 and served from 1915 until her loss in 1919.

The ship was  long, with a beam of  and a depth of . The ship was assessed at 37 disp with a diesel engine that could reach a speed of 19 knots.

Disappearance 
On 29 September 1919, ML-18 along with ML-62 and ML-191 were on passage from Norway when they disappeared in the North Sea. The crew and ships were never found; the number of casualties is unknown.

References

1915 ships
Maritime incidents in 1919
Missing ships
Ships lost with all hands
Ships of the Royal Navy
Shipwrecks in the North Sea